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Astronomy Crossword Puzzle

Across
The distance at which a star must lie in order for its measured parallax to be exactly 1 arc second.
The apparent motion of a relatively close object with respect to a more distant background as the location of the observer changes.
A measure of the flatness of an ellipse.
Celestial coordinate used to measure latitude above or below the celestial equator on the celestial sphere.
Down
A human grouping of stars in the night sky into a recognizable pattern.
The distance that light, moving at a constant speed of 300,00 km/s travels in one year.
Model in which the solar system is centered on the Sun, with Earth in motion around the Sun
The apparent path of the sun, relative to the stars on the celestial sphere, over the course of a year.