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3. An astronomical instrument utilizing a flat mirror driven by a clockwork mechanism to reflect stellar light continuously into a fixed telescope.
7. Measured with respect to the fixed stars rather than the sun.
8. Relating to the equinoxes, when day and night are of approximately equal length worldwide.
9. The apparent annual path of the sun against the background of stars, representing the plane of Earth's orbit.
11. Relating to the apparent oscillating motion of the moon that allows observers to see slightly more than half of its total surface.

1. Connected with the solstices, marking the points when the sun's path reaches its northernmost or southernmost extremes.
2. An astronomical table or database providing calculated positions of celestial objects at regular intervals over time.
4. The angular distance of a celestial body north or south of the celestial equator measured in degrees.
5. Pertaining to the synodic period, the time required for a celestial body to return to the same position relative to the sun and Earth.
6. The branch of astronomy concerned with the precise measurement of positions and movements of stars and other celestial bodies.
10. Pertaining to the apparent displacement or difference in apparent position of an object viewed along two different lines of sight.
12. An ancient astronomical instrument used to locate and calculate the positions of celestial objects for navigation and timekeeping.