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Astrometry includes topics such as Celestial mechanics and Orbital elements. Astrometry is the scientific measurement of the positions and motions of celestial bodies.


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Ecliptic Last Updated on 2008-03-04 00:00:00 Even though the planets move on the celestial sphere, they do not wander all over it but are confined to a narrow strip, dividing it in half. Stars along that strip are traditionally divided into the 12 constellations of the zodiac. The name, related to "zoo," comes because most of these constellations are named for animals--Leo the lion, Aries the ram, Scorpio the scorpion, Cancer the crab, Pisces the fish, Capricorn the goat and Taurus the bull. The apparent path of the Sun across the sky. In summer, the Sun's path is longest, and so are the days. In winter, the Sun's path is shortest, and so are the days. At any time, the Sun is also somewhere on the celestial sphere, and as the Earth turns, it rises and sets the same way as stars do. Like the planets, the Sun, too, moves around the zodiac, making one complete circuit each year. Every month it covers a different constellation of... More »