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Across 2. A date chosen as a reference point for observation. 5. The sunset or sunrise line on the moon or planet. 6. The plane of the earths orbit around the sun. 7. A cloud of interstellar gas or dust 11. The alignment of the optical elements in a telescope. 12. The measure of apparent brightness of a celestial object.

Down 1. An imaginary line running directly overhead from north to south. 3. A pattern of stars identified by name (88 of them) 4. Alignment of two or more astronomical bodies. 8. A large disc or ball of billions of stars, nebula and other objects. 9. The point in the sky directly overhead. 10. The point in which a body in orbit reaches it farthest distance.