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Z

Zenith
A point directly overhead from an observer.

Zodiac
An imaginary belt across the sky in which the Sun, moon, and all of the planets can always be found.

Zodiacal Light
A faint cone of light that can sometimes be seen above the horizon after sunset or before sunrise. Zodiacal light is caused by sunlight reflecting off small particles of material in the plane of the Solar System.
 

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