Unit 2- Celestial Sphere_M

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Celestial Sphere

Back

An imaginary sphere surrounding the Earth used by astronomers to describe the location and movement of celestial objects.

Front

Vernal (Spring) Equinox

Back

March 21 (in the northern hemisphere). Day and night are equal.

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Celestial Equator

Back

An extension of the Earth's equator projected upon the celestial sphere.

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The Ecliptic

Back

Plane in which the Earth moves around the Sun. Also the Sun's apparent annual path around the celestial sphere.

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Earth's tilt

Back

Responsible for the seasons.

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Summer Solstice

Back

June 21, the longest day of the year (in the northern hemisphere).

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Winter Solstice

Back

December 21, the shortest day of the year (in the northern hemisphere).

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Altitude

Back

Angular elevation of a star above the horizon measured in degrees, minutes, and seconds.

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Constellation

Back

A region of the sky that contains a recognizable star pattern and is used to describe the location of objects in space. There are 88 in total. Example: Big Dipper.

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Horoscope

Back

A forecast of a person's future, typically including a delineation of character and circumstances, based on the relative positions of the stars and planets at the time of that person's birth.