| Aldebaran |
an orange binary star in the constellation Taurus, having a combined magnitude of 0.9. |
| Algol |
an eclipsing binary star in the constellation Perseus, having a magnitude that varies between 2.3 and 3.4. |
| Alpha Centauri |
a double star in the constellation Centaurus, the closest star to the solar system, having a combined magnitude of -0.3. |
| Altair |
the brightest star in the constellation Aquila, having a magnitude of 0.8. |
| Andromeda |
an autumn constellation in the northern sky, located between Perseus and Pegasus, with which it shares the bright triple star Alpheratz, and containing a spiral galaxy. [1/2 definitions] |
| Antares |
a red binary star in the constellation Scorpius, having a combined magnitude of 1.0. |
| Aquarius |
an autumn zodiacal constellation located between Capricornus and Pisces; Water Bearer. [1/3 definitions] |
| Aquila |
a summer constellation in the northern sky, located between Lyra and Capricornus and the bright star Altair; Eagle. |
| archer |
(cap.) the constellation or astrological sign of Sagittarius. [1/2 definitions] |
| Arcturus |
an orange star in the constellation Boötes, having a magnitude of zero. |
| Aries |
an autumn zodiacal constellation located between Pisces and Taurus; Ram. [1/3 definitions] |
| Auriga |
a winter constellation in the northern sky, located between Perseus and Gemini and containing the bright triple star Capella and several star clusters; Charioteer. |
| Betelgeuse |
a red variable star in the constellation Orion, having a magnitude of 0.7. |
| Big Dipper |
part of the constellation Ursa Major, made up of its seven brightest stars and forming the shape of a ladle, or dipper. |
| Boötes |
a spring constellation in the northern sky, located between Corona Borealis and Virgo and containing the bright, orange star Arcturus; Herdsman. |
| bull1 |
(cap.) the constellation or astrological sign of Taurus. [1/9 definitions] |
| cancer |
(cap.) a spring zodiacal constellation located between Gemini and Leo; Crab. [1/5 definitions] |
| Canis Major |
a winter constellation in the northern sky, located below Monoceros and containing the brightest of all stars, Sirius; Big Dog. |
| Canis Minor |
a winter constellation in the northern sky, located between Monoceros and Gemini and containing the bright star Procyon; Little Dog. |
| Capella |
a yellow triple star in the constellation Auriga, having a magnitude of 0.1. |
| Capricornus |
an autumn zodiacal constellation located between Sagittarius and Aquarius; Goat. |