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All About Astronomy
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An observer's zenith is the point directly overhead.
Zeta Orionis (Alnitak) is a star at the eastern end of Orion's belt (in the constellation Orion). Alnitak means belt. Alnitak is spectral Type O9.7Ib. It is also known as Alnitah.
The zodiac is a band of 12 constellations along the ecliptic. The constellations in the zodiac include: Capricorn (the goat), Aquarius (the water bearer), Pisces (the fish), Aries (the ram), Taurus (the bull), Gemini (the twins), Cancer (the crab), Leo (the lion), Virgo (the virgin), Libra (the balance), Scorpio (the scorpion), and Sagittarius (the archer).
Zodiacal light is a slight glow in the sky that is near the horizon and has a roughly triangular shape. It is caused by light from the Sun that is reflected by tiny dust particles located in space (this dust is part of our Solar System and is orbiting the Sun).
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