Monday, February 4, 2008

The Naked-eye Planets

In astronomy, the naked-eye planets are the five planets of our solar system that can be discerned with the naked eye without much difficulty. Hence, they were the only planets known to the ancients prior to the invention of the telescope. They are Mercury, Venus, Mars, Jupiter, and Saturn, the five planets closest to Earth. The name planet comes from the Greek term πλανήτης, planētēs, meaning "wanderer", as ancient astronomers noted how certain lights moved across the sky in relation to the other stars. They called these objects asteres planetai, or wandering stars. In some cultures, the Sun and Moon have also been counted as planets, to make the seven classical planets.

Mercury and Venus are only visible in twilight hours as their orbits are interior to the Earth's orbit. Venus is the most prominent planet, being the third brightest object in the sky after the Sun and the Moon. Mercury is more difficult to see due to its unwavering proximity to the Sun. Lengthy twilightelongations make optical filters necessary to see Mercury from extreme northerly locations like Scandinavia or Alaska. Mars is at its brightest when it is in opposition to the Earth, which occurs approximately every two years. Jupiter and Saturn are the largest of the five planets, but are further from the sun, and therefore receive less sunlight. Nonetheless, Jupiter is often the next brightest object in the sky after Venus. Saturn's luminosity is often enhanced by its rings, which reflect light back toward the Earth to varying degrees depending on their inclination to the ecliptic; however, the rings themselves are not visible to the naked eye from the Earth. Uranus and the asteroid Vesta are visible to the naked eye in principle on very clear nights, but unlike the true naked-eye planets they are always less luminous than several thousands of stars, and as such, do not stand out enough for their existences to be noticed without the aid of a telescope. and an extremely low angle at maximum

Babylonia


Babylonia was a state in southern Mesopotamia, in modern Iraq, combining the territories of Sumer and Akkad. The earliest mention of the city of Babylon can be found in a tablet from the reign of Sargon of Akkad, dating back to the 23rd century BC.

The Akkadians, a Semitic people, had early on come to dominate the region around Kish — including Babylon and the parts of Mesopotamia just north of Sumer, whose civilization deeply influenced that of Akkad. An area intensely irrigated, and strategically located for trade routes and commerce, it was often under threat from outsiders throughout its history.

By the "neo-Sumerian" or Ur-III period, Babylon had become a centre for Amorite migrants from west of the Euphrates who had settled north of Sumer. The Amorites were another Semitic-speaking people, who were at first regarded as uncivilized and nomadic shepherds by the more settled, crop-growing, Akkadians.

At around 2000 BC, following the collapse of the "Ur-III" dynasty at the hands of the Elamites, Semitic Amorites from west of the Euphrates River gained control over most of Mesopotamia, where they formed a series of small kingdoms. During the first centuries of what is called the "Amorite period", the most powerful city state was Isin, although Shamshi-Adad I came close to uniting the more northern regions. One of these Amorite dynasties was established in the city-stateOld Babylonian Period. of Babylon, which would ultimately take over the others and form the first Babylonian empire, during what is also called the

The city of Babylon obtained hegemony over Mesopotamia under their sixth ruler, Hammurabi (c. 1780– c. 1750 BC; dates highly uncertain). He was a very efficient ruler, writing an influential law code, Hammurabi's Code and giving the region stability after turbulent times, thereby transforming it into the central power of Mesopotamia.

Babylonian beliefs held the king as an agent of Marduk, and the city of Babylon as a "holy city" where any legitimate ruler of Mesopotamia had to be crowned. A natural development was the establishment of a bureaucracy, with taxation and centralized government, to allow the king to exert his control.

A great literary revival followed the recovery of Babylonian independence. One of the most important works of this "First Dynasty of Babylon", as it was called by the native historians, was the compilation of a code of laws. This was made by order of Hammurabi after the expulsion of the Elamites and the settlement of his kingdom. In 1901, a copy of the Code of Hammurabi was discovered by J. De Morgan and V. Scheil at Susa, where it had been taken as plunder. That copy is now in the Louvre.

The Babylonians engaged in regular trade with city-states to the west; with Babylonian officials or troops sometimes passing to Syria and Canaan, and Amorite merchants operating throughout Mesopotamia. The Babylonian monarchy's western connections remained strong for quite some time. An Amorite named Abi-ramu or Abram was the father of a witness to a deed dated to the reign of Hammurabi's grandfather; Ammi-Ditana, great-grandson of Hammurabi, still titled himself "king of the land of the Amorites". Ammi-Ditana's father and son also bore Canaanite names: Abi-Eshuh and Ammisaduqa.

The armies of Babylonia were well-disciplined, and they conquered the city-states of Isin, Elam, and Uruk, and the strong Kingdom of Mari. The rule of Babylon was obeyed as far as the shores of the Mediterranean. But Mesopotamia had no natural, defensible boundaries, making it vulnerable to attack. Trade and culture thrived for around 150 years until Babylon was sacked by the Hittites in the reign of Samsu-Ditana, ushering in the age of the Kassites who filled in the power vacuum.

The date of the sack of Babylon by the Hittite king Mursilis I is considered crucial to the various calculations of the early Chronology of the ancient Near East, since both a solar and a lunar eclipse are said to have occurred in the month of Sivan that year, according to ancient records. The event has been variously calculated to dates ranging from 1499 BC to 1659 BC; the "Middle Chronology" most widely used today places it in 1595 BC.

The 14th king of the dynasty was Samsu-Ditana, son of Ammisaduqa. He was overthrown following the sack of Babylon in c. 1595 BC by the Hittite king Mursili I, and Babylonia was turned over to the Kassites (Kossaeans) from the mountains of Iran, with whom Samsu-Iluna had already come into conflict in his 6th year. The Kassite dynasty was founded by Kandis or Gandash of Mari. The Kassites renamed Babylon "Kar-Duniash", and their rule lasted for 576 years. With this foreign dominion — that offers a striking analogy to the contemporary rule of the Hyksos in ancient Egypt — Babylonia lost its empire over western Asia. The high-priests of Ashur made themselves kings of Assyria. Most divine attributes ascribed to the Semitic kings of Babylonia disappeared at this time; the title of "god" was never given to a Kassite sovereign. However, Babylon continued to be the capital of the kingdom and the 'holy' city of western Asia, where the priests were all-powerful, and the only place where the right to inheritance of the old Babylonian empire could be conferred.

Through the centuries of Assyrian domination, Babylonia enjoyed a prominent status, or revolted at the slightest indication that it did not. However, the Assyrians always managed to restore Babylonian loyalty, whether through granting of increased privileges, or militarily. That finally changed in 627 BC with the death of the last strong Assyrian ruler, Ashurbanipal, and Babylonia rebelled under Nabopolassar the Chaldean the following year. With help from the Medes, Nineveh was sacked in 612 BC, and the seat of empire was again transferred to Babylonia.

Nabopolassar was followed by his son Nebuchadnezzar II, whose reign of 43 years made Babylon once more the mistress of the civilized world, including the conquering of Phoenicia in 585 BC.567 BC, and referring to "Phut of the Ionians". Only a small fragment of his annals has been discovered, relating to his invasion of Egypt in

Of the reign of the last Babylonian king, Nabonidus (Nabu-na'id), and the conquest of Babylonia by Cyrus, there is a fair amount of information available. This is chiefly derived from a chronological tablet containing the annals of Nabonidus, supplemented by another inscription of Nabonidus where he recounts his restoration of the temple of the Moon-god at Harran; as well as by a proclamation of Cyrus issued shortly after his formal recognition as king of Babylonia. It was in the sixth year of Nabonidus (549 BC) that Cyrus, the Achaemenid Persian "king of Anshan" in Elam, revolted against his suzerain Astyages, "king of the Manda" or Medes, at Ecbatana. Astyages' army betrayed him to his enemy, and Cyrus established himself at Ecbatana, thus putting an end to the empire of the Medes. Three years later Cyrus had become king of all Persia, and was engaged in a campaign in the north of Mesopotamia. Meanwhile, Nabonidus had established a camp in the desert, near the southern frontier of his kingdom, leaving his son Belshazzar (Belsharutsur) in command of the army.

In 539 BC Cyrus invaded Babylonia. A battle was fought at Opis in the month of June, where the Babylonians were defeated; and immediately afterwards Sippara surrendered to the invader. Nabonidus fled to Babylon, where he was pursued by Gobryas, and on the 16th of Tammuz, two days after the capture of Sippara, "the soldiers of Cyrus entered Babylon without fighting." Nabonidus was dragged from his hiding-place, where the services continued without interruption. Cyrus did not arrive until the 3rd of Marchesvan (October), Gobryas having acted for him in his absence. Gobryas was now made governor of the province of Babylon, and a few days afterwards the son of Nabonidus died. A public mourning followed, lasting six days, and Cambyses accompanied the corpse to the tomb.

Cyrus now claimed to be the legitimate successor of the ancient Babylonian kings and the avenger of Bel-Marduk, who was assumed to be wrathful at the impiety of Nabonidus in removing the images of the local gods from their ancestral shrines, to his capital Babylon. Nabonidus, in fact, had excited a strong feeling against himself by attempting to centralize the religion of Babylonia in the temple of Merodach (Marduk) at Babylon, and while he had thus alienated the local priesthoods, the military party despised him on account of his antiquarian tastes. He seems to have left the defense of his kingdom to others, occupying himself with the more congenial work of excavating the foundation records of the temples and determining the dates of their builders.

The invasion of Babylonia by Cyrus was doubtless facilitated by the existence of a disaffected party in the state, as well as by the presence of foreign forced exiles like the Jews, who had been planted in the midst of the country. One of the first acts of Cyrus accordingly was to allow these exiles to return to their own homes, carrying with them the images of their gods and their sacred vessels. The permission to do so was embodied in a proclamation, whereby the conqueror endeavored to justify his claim to the Babylonian throne. The feeling was still strong that none had a right to rule over western Asia until he had been consecrated to the office by Bel and his priests; and accordingly, Cyrus henceforth assumed the imperial title of "King of Babylon."

A year before Cyrus' death, in 529 BC, he elevated his son Cambyses II in the government, making him king of Babylon, while he reserved for himself the fuller title of "king of the (other) provinces" of the empire. It was only when Darius Hystaspis acquired the Persian throne and ruled it as a representative of the Zoroastrian religion, that the old tradition was broken and the claim of Babylon to confer legitimacy on the rulers of western Asia ceased to be acknowledged.

Immediately after Darius seized Persia, Babylonia briefly recovered its independence under Nidinta-Bel, who took the name of Nebuchadnezzar III, and reigned from October 522 BC to August 520 BC, when Darius took the city by storm. A few years later, probably 514 BC, Babylon again revolted under Arakha; on this occasion, after its capture by the Persians, the walls were partly destroyed. E-Saggila, the great temple of Bel, however, still continued to be kept in repair and to be a center of Babylonian patriotism, until at last the foundation of Seleucia diverted the population to the new capital of Babylonia and the ruins of the old city became a quarry for the builders of the new seat of government.

In Babylonia, an abundance of clay, and lack of stone, led to greater use of mudbrick; Babylonian temples are massive structures of crude brick, supported by buttresses, the rain being carried off by drains. One such drain at Ur was made of lead. The use of brick led to the early development of the pilaster and column, and of frescoes and enamelled tiles. The walls were brilliantly coloured, and sometimes plated with zinc or gold, as well as with tiles. Painted terra-cotta cones for torches were also embedded in the plaster.

In Babylonia, in place of the bas-relief, there is greater use of three-dimensional figures in the round — the earliest examples being the statues from Telloh, that are realistic if somewhat clumsy. The paucity of stone in Babylonia made every pebble precious, and led to a high perfection in the art of gem-cutting.

The legendary Hanging Gardens of Babylon and the Tower of Babel are seen as symbols of luxurious and arrogant power respectively.

Among the sciences, astronomy and astrology occupied a conspicuous place in Babylonian society. Astronomy was of old standing in Babylonia, and the standard work on the subject, written from an astrological point of view, later translated into Greek by Berossus, was believed to date from the age of Sargon of Akkad. The zodiac was a Babylonian invention of great antiquity; and eclipses of the sun and moon could be foretold. There are dozens of cuneiform records of original Mesopotamian eclipse observations .Observatories were attached to the temples, and reports were regularly sent by astronomers to the king. The stars had been numbered and named at an early date, and we possess tables of lunar longitudes and observations of Venus. Great attention was naturally paid to the calendar, and we find a week of seven days and another of five days in use.

Babylonian astrology was based on the belief that the entire universe was created in relation to the earth. Thus the ancients saw it as no accident that the stars and planets were set in a certain divine order at the time of creation.

The first evidence of recognition that astronomical phenomena are periodic and of the application of mathematics to their prediction is Babylonian. Tablets dating back to the Old Babylonian periodcuneiform tablets known as the 'Enūma Anu Enlil'. The oldest significant astronomical text that we possess is Tablet 63 of 'Enūma Anu Enlil', the Venus tablet of Ammi-saduqa, which lists the first and last visible risings of Venus over a period of about 21 years and is the earliest evidence that the phenomena of a planet were recognized as periodic. The oldest rectangular astrolabe dates back to Babylonia ca. 1100 BC. The MUL.APIN, contains catalogues of stars and constellations as well as schemes for predicting heliacal risings and the settings of the planets, lengths of daylight measured by a water-clock, gnomon, shadows, and intercalations. The Babylonian GU text arranges stars in 'strings' that lie along declination circles and thus measure right-ascensions or time-intervals, and also employs the stars of the zenith, which are also separated by given right-ascensional differences. document the application of mathematics to the variation in the length of daylight over a solar year.

During the 8th and 7th centuries BC, Babylonian astronomers developed a new approach to astronomy. They began studying philosophy dealing with the ideal nature of the early universe and began empoying an internal logic within their predictive planetary systems. This was an important contribution to astronomy and the philosophy of science and some scholars have thus referred to this new approach as the first scientific revolution.This new approach to astronomy was adopted and further developed in Greek and Hellenistic astronomy.

In Seleucid and Parthian times, the astronomical reports were of a thoroughly scientific character; how much earlier their advanced knowledge and methods were developed is uncertain. The Babylonian development of methods for predicting the motions of the planets is considered to be a major episode in the history of astronomy.

The only Babylonian astronomer known to have supported a heliocentric model of planetary motion was Seleucus of Seleucia (b. 190 BC). Seleucus is known from the writings of Plutarch. He supported the heliocentric theory where the Earth rotated around its own axis which in turn revolved around the Sun. According to Plutarch, Seleucus even proved the heliocentric system, but it is not known what arguments he used.

Babylonian astronomy was the basis for much of what was done in Greek and Hellenistic astronomy, in classical Indian astronomy, in Sassanian, Byzantine and Syrian astronomy, in medieval Islamic astronomy, and in Central Asian and Western European astronomy.

The Babylonian system of mathematics was sexagesimal, or a base 60 numeral system (see: Babylonian numerals). From this we derive the modern day usage of 60 seconds in a minute, 60 minutes in an hour, and 360 (60 x 6) degrees in a circle. The Babylonians were able to make great advances in mathematics for two reasons. First, the number 60 has many divisors (2, 3, 4, 5, 6, 10, 12, 15, 20, and 30), making calculations easier. Additionally, unlike the Egyptians and Romans, the Babylonians had a true place-value system, where digits written in the left column represented larger values (much as in our base-ten system: 734 = 7×100 + 3×10 + 4×1). Among the Babylonians' mathematical accomplishments were the determination of the square root of twoYBC 7289 clay tablet). They also demonstrated knowledge of the Pythagorean theorem well before Pythagoras, as evidenced by this tablet translated by Dennis Ramsey and dating to ca. 1900 BC: correctly to seven places (

4 is the length and 5 is the diagonal. What is the breadth? Its size is not known. 4 times 4 is 16. And 5 times 5 is 25. You take 16 from 25 and there remains 9. What times what shall I take in order to get 9? 3 times 3 is 9. 3 is the breadth.

The ner of 600 and the sar of 3600 were formed from the unit of 60, corresponding with a degree of the equator. Tablets of squares and cubes, calculated from 1 to 60, have been found at Senkera, and a people acquainted with the sun-dial, the clepsydra, the lever and the pulley, must have had no mean knowledge of mechanics. A crystal lens, turned on the lathe, was discovered by Austen Henry Layard at Nimrud along with glass vases bearing the name of Sargon; this could explain the excessive minuteness of some of the writing on the Assyrian tablets, and a lens may also have been used in the observation of the heavens.

The Babylonians might have been familiar with the general rules for measuring the areas. They measured the circumference of a circle as three times the diameter and the area as one-twelfth the square of the circumference, which would be correct if π were estimated as 3. The volume of a cylinder was taken as the product of the base and the height, however, the volume of the frustum of a cone or a square pyramid was incorrectly taken as the product of the height and half the sum of the bases. Also, there was a recent discovery in which a tablet used π as 3 and 1/8. The Babylonians are also known for the Babylonian mile, which was a measure of distance equal to about seven miles today. This measurement for distances eventually was converted to a time-mile used for measuring the travel of the Sun, therefore, representing time. he oldest Babylonian texts on medicine date back to the First Babylonian Dynasty in the first half of the 2nd millenium BC. The most extensive Babylonian medical text, however, is the Diagnostic Handbook written by the physician Esagil-kin-apli of Borsippa,[10] during the reign of the Babylonian king Adad-apla-iddina (1069-1046 BC).

Along with contemporary ancient Egyptian medicine, the Babylonians introduced the concepts of diagnosis, prognosis, physical examination, and prescriptions. In addition, the Diagnostic Handbook introduced the methods of therapy and aetiology and the use of empiricism, logic and rationality in diagnosis, prognosis and therapy. The text contains a list of medical symptoms and often detailed empirical observations along with logical rules used in combining observed symptoms on the body of a patient with its diagnosis and prognosis.

The symptoms and diseases of a patient were treated through therapeutic means such as bandages, creams and pills. If a patient could not be cured physically, the Babylonian physicians often relied on exorcism to cleanse the patient from any curses. Esagil-kin-apli's Diagnostic Handbook was based on a logical set of axioms and assumptions, including the modern view that through the examination and inspection of the symptoms of a patient, it is possible to determine the patient's disease, its aetiology and future development, and the chances of the patient's recovery.

Esagil-kin-apli discovered a variety of illnesses and diseases and described their symptoms in his Diagnostic Handbook. These include the symptoms for many varieties of epilepsy and related ailments along with their diagnosis and prognosis.

There were libraries in most towns and temples; an old Sumerian proverb averred that "he who would excel in the school of the scribes must rise with the dawn." Women as well as men learned to read and write, and in Semitic times, this involved knowledge of the extinct Sumerian language, and a complicated and extensive syllabary.

A considerable amount of Babylonian literature was translated from Sumerian originals, and the language of religion and law long continued to be the old agglutinative language of Sumer. Vocabularies, grammars, and interlinear translations were compiled for the use of students, as well as commentaries on the older texts and explanations of obscure words and phrases. The characters of the syllabary were all arranged and named, and elaborate lists of them were drawn up.

There are many Babylonian literary works whose titles have come down to us. One of the most famous of these was the Epic of Gilgamesh, in twelve books, translated from the original Sumerian by a certain Sin-liqi-unninni, and arranged upon an astronomical principle. Each division contains the story of a single adventure in the career of Gilgamesh. The whole story is a composite product, and it is probable that some of the stories are artificially attached to the central figure.

The origins of Babylonian philosophy can be traced back to early Mesopotamian wisdom, which embodied certain philosophies of life, particularly ethics, in the forms of dialectic, dialogs, epic poetry, folklore, hymns, lyrics, prose, and proverbs. Babylonian reasoning and rationality developed beyond empirical observation.

It is possible that Babylonian philosophy had an influence on Greek, particularly Hellenistic philosophy. The Babylonian text Dialog of Pessimism contains similarities to the agonistic thought of the sophists, the Heraclitean doctrine of contrasts, and the dialogs of Plato, as well as a precursor to the maieutic Socratic method of Socrates. The Milesian philosopher Thales is also known to have studied philosophy in Mesopotamia.

Babylonia, and particularly its capital city Babylon, has long held a place in Abrahamic religions as a symbol of excess and dissolute power. Many references are made to Babylon in the Bible, both literally and allegorically. The mentions in the Tanakh tend to be historical or prophetic, while New Testament references are more likely figurative, or cryptic references to pagan Rome. The legendary Hanging Gardens of Babylon and the Tower of Babel are seen as symbols of luxurious and arrogant power respectively.



The Ecliptic Longitude

Ecliptic longitude (solar longitude or celestial longitude) is one of the co-ordinates which can be used to define the location of an astronomical object on the celestial sphere in the ecliptic coordinate system. In this system, the celestial sphere is divided into two hemispheres by the plane of the ecliptic.

The ecliptic is the path followed by the sun across the celestial sphere during the year. It crosses the celestial equator twice during the year, once at the Autumnal equinox and once at the Vernal equinox. There is no obvious point along the ecliptic at which ecliptic longitude should be zero, and so zero is arbitrarily defined as the location of the sun at Vernal equinox. Ecliptic longitude is then the angular distance of the object eastwards along the ecliptic from this point.

Ecliptic co-ordinates are most useful for solar system objects. For example when an almanac give the longitude of the Sun, ecliptic longitude is meant.

Constellation of Stars

A constellation is a group of stars that are connected together to form a figure or picture. The term is also traditionally and less formally used to mean any group of stars visibly related to each other, if they are considered as a fixed configuration or pattern in a particular culture.

Some well-known constellations contain striking and familiar patterns of bright stars. Examples are Orion (containing a figure of a hunter), Leo (containing bright stars outlining the form of a lion), Scorpius (a scorpion), and Crux (a cross).

Photo of the familiar constellation Orion.


The International Astronomical Union (IAU) divides the sky into 88official constellations with exact boundaries, so that every direction or place in the sky belongs within one constellation. In the northern celestial hemisphere, these are mostly based upon the constellations of the ancient GreekMiddle Ages, and contains the signs of the zodiac.The sun appears to pass through the 12 constellations of the zodiac and ancient Greek astronomers believed they had a special significance.tradition, passed down through the

The constellation boundaries were drawn up by Eugène Delporte in 1930, and he drew them along vertical and horizontal lines of right ascension and declination. However, he did so for the epochB1875.0, the era when Benjamin A. Gould made the proposal on which Delporte based his work. The consequence of the early date is that due to precession of the equinoxes, the borders on a modern star map (eg, for epoch J2000) are already somewhat skewed and no longer perfectly vertical or horizontal. This skew will increase over the years and centuries to come.

In three-dimensional space, most of the stars we see have little or no relation to one another, but can appear to be grouped on the celestial sphere of the night sky.

A star pattern may be widely known but may not be recognized by the International Astronomical Union; such a pattern of stars is called an asterism. An example is the grouping called the Big Dipper (North America) or the Plough (UK).

The stars in a constellation or asterism rarely have any astrophysical relationship to each other; they just happen to appear close together in the sky as viewed from Earth and typically lie many light-years apart in space. However, one exception to this is the Ursa Major moving group.

The grouping of stars into constellations is essentially arbitrary, and different cultures have had different constellations, although a few of the more obvious ones tend to recur frequently.

Ecliptic

Zodiac denotes an annual cycle of twelve stations along the ecliptic, the apparent path of the sun across the heavens through the constellations that divide the ecliptic into twelve equal zones of celestial longitude. The zodiac is recognized as the first known celestial coordinate system. There are two independently-created zodiacs from which the modern Western world derived its understanding of zodiac systems. Babylonian astrology, inherited by [[astrology, developed the The etymology of the term zodiac comes from the Latin zōdiacus, from the Greek ζῳδιακός [κύκλος], meaning "[circle] of animals", derived from ζῴδιον, the diminutive of ζῷον "animal". However, the classical Greek zodiac also includes signs (also constellations) that are not represented by animals (e.g., Libra, Virgo, Gemini). Another suggested etymology is that the Greek term is cognate with the Sanskrit sodi, denoting "a path", i.e., the path through which the Sun travels.

The zodiac also means a region of the celestial sphere that includes a band of eight arc degrees above and below the ecliptic, and therefore encompasses the paths of the Moon and the naked eye planets (Mercury, Venus, Mars, Jupiter, and Saturn). The classical astronomers called these planets wandering stars to differentiate them from the fixed stars of the celestial sphere (Ptolemy). Astrologers understood the movement of the planets and the Sun through the zodiac as a means of explaining and predicting events on Earth.

Zodiac

Zodiac denotes an annual cycle of twelve stations along the ecliptic, the apparent path of the sun across the heavens through the constellations that divide the ecliptic into twelve equal zones of celestial longitude. The zodiac is recognized as the first known celestial coordinate system. There are two independently-created zodiacs from which the modern Western world derived its understanding of zodiac systems. Babylonian astrology, inherited by [[astrology, developed the The etymology of the term zodiac comes from the Latin zōdiacus, from the Greek ζῳδιακός [κύκλος], meaning "[circle] of animals", derived from ζῴδιον, the diminutive of ζῷον "animal". However, the classical Greek zodiac also includes signs (also constellations) that are not represented by animals (e.g., Libra, Virgo, Gemini). Another suggested etymology is that the Greek term is cognate with the Sanskrit sodi, denoting "a path", i.e., the path through which the Sun travels.

The zodiac also means a region of the celestial sphere that includes a band of eight arc degrees above and below the ecliptic, and therefore encompasses the paths of the Moon and the naked eye planets (Mercury, Venus, Mars, Jupiter, and Saturn). The classical astronomers called these planets wandering stars to differentiate them from the fixed stars of the celestial sphere (Ptolemy). Astrologers understood the movement of the planets and the Sun through the zodiac as a means of explaining and predicting events on Earth.

The Obelisks

Why do many world capitals have Obelisks placed in their capitals?

There are 28 known ancient Egyptian obelisks in the following current locations:

  • Egypt – 8
    • Pharaoh Tuthmosis I, Karnak Temple, Luxor
    • Pharaoh Ramses II, Luxor Temple
    • Pharaoh Hatshepsut, Karnak Temple, Luxor
    • Pharaoh Senusret I, Heliopolis, Cairo
    • Pharaoh Ramses III, Luxor Museum
    • Pharaoh Ramses II, Gezira Island, Cairo, 20.4 m
    • Pharaoh Ramses II, Cairo International Airport, 16.97 m
    • Pharaoh Seti II, Karnak Temple, Luxor, 7 m
  • France – 1
    • Pharaoh Ramses II, in Place de la Concorde, Paris
  • Israel – 1
    • Caesarea obelisk
  • Italy – 11 (includes the only one located in the Vatican City)
    • 8 in Rome (see Obelisks in Rome)
    • Piazza del Duomo, Catania (Sicily)
    • Boboli Gardens (Florence)
    • Urbino
  • Poland – 1
    • Ramses II, Poznań Archaeological Museum, Poznań (on loan from Ägyptisches Museum und Papyrussammlung, Berlin
  • Turkey – 1
    • Pharaoh Tuthmosis III, in Square of Horses, Istanbul
  • United Kingdom – 4
    • Pharaoh Tuthmosis III, Cleopatra's Needle, on Victoria Embankment, London
    • Pharaoh Amenhotep II, in the Oriental Museum, University of Durham
    • Pharaoh Ptolemy IX, Philae Obelisk, at Kingston Lacy, near Wimborne Minster, Dorset
    • Pharaoh Nectanebo II, British Museum, London
  • United States – 1
    • Pharaoh Tuthmosis III, Cleopatra's Needle, in Central Park, New York