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Encyclopedia: Precession of the equinoxes

The precession of the equinoxes refers to the precession of Earth's axis of rotation with respect to inertial space.

Hipparchus discovered that the positions of the equinoxes move westward along the ecliptic compared to the fixed stars on the celestial sphere. The exact dates of his life are not known, but astronomical observations attributed to him date from 147 BC to 127 BC and were described in his writings.

Translations

How to say "Precession of the equinoxes" in other languages:

	(Chinese)	分點歲差
	(Italian)	Precessione degli equinozi

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134 BC

of Judea following the murder of his father Simon Maccabaeus by Ptolemy the son of Abubus. Hipparchus discovers the precession of the equinoxes Hipparchus creates a star catalogue Births Deaths...

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Kochab

star from 1900 BC to 1100 BC. Due to precession of the equinoxes, the previous holder of the title... III of apparent magnitude 2.2 -- this makes its absolute brightness 190 times that of the Sun, though its surface is cool at 3600 Kelvin. Its mass is estimated to be some 4.4 times that of the Sun. Its...

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Sidereal Astrology

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Solar Age

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Timocharis

star catalogue to Timocharis' and discover that the longitude of the stars had changed over time, which led him to determine the first value of the precession of the equinoxes. Timocharis was the first... born in Alexandria, he was a contemporary of Euclid. In approximatelly 300 BC, with the help of...

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Tropical zodiac

. This is due to the Precession of the equinoxes. This is in contrast to the sidereal zodiac, which is... northern hemisphere vernal equinox as the first point of the sign of Aries. The signs of the zodiac... The tropical zodiac is based upon tropical time, or the apparent motion of the sun across the sky...

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Celestial pole

). The fact that Polaris is near the pole is purely a coincidence. In fact, because of precession of the equinoxes, Polaris is only near the pole for a small fraction of the time. This article... the sky in 24 (sidereal) hours. This phenomenon is due to the spinning of the Earth on its axis. The...

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1825 in science

, tides, the precession of the equinoxes, the libration of the Moon, and Saturn's rings in Mecanique... The year 1825 in science and technology included many events, some of which are listed here. See also: 1824 in science, other events of 1825, 1826 in science and the list of years in science...

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Alrai

the Earth's northern pole star, due to the precession of the equinoxes. Alrai will become closer to... years from Earth, with an apparent magnitude of 3.22. Its name derives from the Arabic Al-ra'i, meaning "the shepherd". The Alrai system consists of two stars. The larger and brighter is a K1 III-IV...

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Joseph Adhemar

knew of the 22,000 year cycle of precession of the equinoxes, and theorised that the ice ages occurred... that ice ages were controlled by astronomical forcing in his 1842 book Revolutions of the Sea . The... solstice; and the spring and autumn equinox; intersect with the sun at right angles. Currently, the...

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