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Astronomy crossword

Across
A measure of the flatness of an ellipse.
Celestial coordinate used to measure latitude above or below the celestial equator in the celestial sphere.
Human grouping of stars in the night sky into a recognizable pattern
12 constellations on the celestial sphere through which the Sun appears to pass during the course of a year.
The apparent path of the Sun, relative to the stars on the celestial sphere, over the course of a year.
Down
Model of the solar system that holds Earth at the center of the universe.
A device that measures the total amount of light received in all or part of the image.
Distance at which a star must lie in order for its measured parallax to be exactly 1 arc second.