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Views Of The Solar System
Hilda Said:what were the first views of the solar system starting from the begining of mankind to now?
I give some hint on ancient astronomy
Early cultures identified celestial objects with gods and spirits. They related these objects (and their movements) to phenomena such as rain, drought, seasons, and tides. It is generally believed that the first "professional" astronomers were priests (, and that their understanding of the "heavens" was seen as "divine".
Ancient Indian astronomy is based upon sidereal calculation. The sidereal astronomy is based upon the stars and the sidereal period is the time that it takes the object to make one full orbit around the Sun, relative to the stars.
Around 500 AD, Aryabhata presented a mathematical system that took the Earth to spin on its axis and considered the motions of the planets with respect to the Sun. (Heliocentric)
He also made an accurate approximation of the Earth's circumference and diameter, and also discovered how the lunar eclipse and solar eclipse happen. He gives the radius of the planetary orbits in terms of the radius of the Earth/Sun orbit as essentially their periods of rotation around the Sun. He was also the earliest to discover that the orbits of the planets around the Sun are ellipses. (Loooong before Kepler found!!)
Astronomy was advanced during the Sunga Empire and many star catalogues were produced during this time. The Sunga period is known as the "Golden age of astronomy in India".
Brahmagupta (598-668) He was the earliest to use algebra to solve astronomical problems. He also developed methods for calculations of the motions and places of various planets, their rising and setting, conjunctions, and the calculation of eclipses.
Bhaskara (1114-1185) He also calculated the time taken for the Earth to orbit the sun to 9 decimal places. The Buddhist University of Nalanda at the time offered formal courses in astronomical studies. Other important astronomers from India include Madhava of Sangamagrama, Nilakantha Somayaji and Jyeshtadeva
The origins of Western astronomy can be found in Mesopotamia. Tablets dating back to the Old Babylonian period document the application of mathematics to the variation in the length of daylight over a solar year. Centuries of Babylonian observations of celestial phenomena are recorded in the series of cuneiform tablets known as the En?ma Anu Enlil. The oldest significant astronomical text that we possess is Tablet 63 of the En?ma 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 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.
Babylonian astronomer Seleucus of Seleucia, was a supporter of the heliocentric model.
Pyramids were aligned towards the pole star. Temple of Amun-Re at Karnak was aligned on the rising of the midwinter sun.The length of the corridor down which sunlight would travel would have limited illumination at other times of the year.
Astronomy played a considerable part in religious matters for fixing the dates of festivals and determining the hours of the night. The titles of several temple books are preserved recording the movements and phases of the sun, moon and stars. The rising of Sirius (Egyptian: Sopdet, Greek: Sothis) at the beginning of the inundation was a particularly important point to fix in the yearly calendar.
Greek geometrical astronomy developed away from the model of concentric spheres to employ more complex models in which an eccentric circle would carry around a smaller circle, called an epicycle which in turn carried around a planet.
In the 3rd century BC Aristarchus of Samos suggested a heliocentric system, Eratosthenes, using the angles of shadows created at widely-separated regions, estimated the circumference of the Earth with great accuracy
The astronomy of East Asia began in China. Astronomy in China has a long history. Detailed records of astronomical observations were kept from about the 6th century BC, until the introduction of Western astronomy and the telescope in the 17th century. Chinese astronomers were able to precisely predict comets and eclipses.Astronomers took careful note of "guest stars" which suddenly appeared among the fixed stars. They were the first to record a supernova.
Maya astronomical codices include detailed tables for calculating phases of the Moon, the recurrence of eclipses, and the appearance and disappearance of Venus a
Tracy Said:What would happen to the solar system?
We Answered:It would have no effect at all on the solar system. None. Nada. Nil. Zip. Zilch. Zippo. Zero.
Christopher Said:Which of the two views of the solar system is earth-centered and which is sun-centered??
We Answered:Earth-centred: "Geocentric"
Ethel Said:How to view the solar system from the viewpoints of Platonic solid within another Platonic solid in past?
We Answered:Are you looking to learn more about the Mysterium Cosmographicum that Johannes Kepler developed early in his career while teaching at the University of Graz in Austria? This was where he tried to define planetary orbits in terms of being circumscribed or circumscribing various nested platonic solids (tetrahedron, cube, octahedron, etc.)
Kepler at Graz: http://en.wikipedia.org/wiki/Johannes_ke…
Gladys Said:A new discovery of a planet in our solar system?
We Answered:Dear Sir:
You refer, of course, to a recent Sci Fi Movie Plot which had this as its main "gotcha" line. If you bought this, you would go along with every thing else that followed.
First of all, such a planet would have been seen by any one of the many space probes which we have sent aloft in the past fifteen years or so. Two, at least, are in very deep space and could have seen any planet hiding on our opposite Sun side.
Second, viewing our Solar System from distant space is not such a big deal... We have had satelite space probes fly to the planets Saturn, and Mars already. Enroute those probes would have stayed in communication with the Earth and if any planet were on the back side of the Sun, those probes would have detected it because the Earth was moving around the Sun during space probe flight.
Thanks for asking anyhow... Cool Flick.
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