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Uploaded: 15 Sep 2012 (14 years ago) · Shared: 12 May 2022
Video Description (from Youtube)
http://www.principiauniversi.com/ The word "planet" comes from the Greek word "planetos" meaning wandering star (thus, unlike the Earth, in Ptolemy's model, the Sun and Moon were planets). Because ofretrograde, for centuries unexplainable movements, the heavenly bodies in Ptolemy's model does not move by ellipses but rather by curves called epicycles.
This animation shows simplified Ptolemy's model of the Universe with Moon as a first, and Sun as a fourth planet orbiting around Earth. All planets except Moon and Sun are moving on epicycles whit their centres positioned on circles called deferent. Last sphere, after Saturn, is a sphere of Stars. In this particular figure, orbital periods are adjusted so they always draw the same path.
The background sound is Simphonies of planets recorded by NASA Voyager.
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Overview & Key Concepts
What is Astrology?
Astrology is the study of the movements and relative positions of celestial objects as a means for divining information about human affairs and
terrestrial events. Astrology has been dated to at least the 2nd millennium BCE, and has its roots in calendrical systems used to predict seasonal shifts and to interpret celestial cycles as signs of divine communications. Many cultures have attached importance to astronomical events, and some - such as the Indians, Chinese, and Maya - developed elaborate systems for predicting terrestrial events from celestial observations. Western astrology, one of the oldest astrological systems still in use, can trace its roots to 19th-17th century BCE Mesopotamia, from which it spread to Ancient Greece, Rome, the Arab world and eventually Central and Western Europe. Contemporary Western astrology is often associated with systems of horoscopes that purport to explain aspects of a person's personality and predict significant events in their lives based on the positions of celestial objects; the majority of professional astrologers rely on such systems.
Who was Ptolemy?
Ptolemy I Soter (367 BC-282 BC) was a Macedonian Greek general under Alexander the Great. He was one of the three Diadochi who succeeded to his
empire. Ptolemy became ruler of Egypt (323-282 BC) and founded a dynasty which ruled it for the next three centuries, turning Egypt into a Hellenistic kingdom and Alexandria into a center of Greek culture. He assimilated some aspects of Egyptian culture, however, assuming the traditional title pharaoh in 305/4 BC.
