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| the magnitude of a star as it would appear to a hypothetical observer at a distance of 10 parsecs or 32.6 light-years |
| the small circle of the celestial sphere whose plane is tangent to the earth at the position of the observer |
| Aries (âr'ēz) Pronunciation Key
A constellation in the Northern Hemisphere near Taurus and Pisces. Aries (the Ram) is the first sign of the zodiac. |