General astronomy

General astronomy

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General astronomy

asterism

Astronomy; General astronomy

a group of bright stars which form a conspicuous pattern on the celestial sphere

asteroid (minor planet, planetoid)

Astronomy; General astronomy

Also called planetoids or minor planets, the asteroids are tiny planets most of which orbit the Sun between Mars and Jupiter. The largest - and the first discovered - is Ceres, with a diameter of ...

asteroid belt

Astronomy; General astronomy

A region of space lying between Mars (1.5 AU) and Jupiter (5.2 AU), where the great majority of the asteroids are found. None of the belt asteroids have retrograde motion.

1) Divination using the positions of the planets, the Sun and the Moon as seen against the stars in the constellations of the zodiac - a "science" almost as old as homo sapiens. Although at one stage ...

astrometry

Astronomy; General astronomy

The branch of astronomy that deals with measuring the positions of celestial objects, especially stars. Astrometrists measure parallaxes and proper motions, which allow astronomers to determine the ...