Across
- 4. An expert in or student of mathematics.
- 5. A formal and systematic written discourse on some subject.
- 7. A close similarity, connection, or equivalence.
- 10. An optical instrument designed to make distant objects appear nearer.
- 12. Relating to astronomy
Down
- 1. the fact or phenomenon of light, radio waves, etc.
- 2. (of a person) liable to unreasonable changes of mood.
- 3. The time or date (twice each year) at which the sun crosses the celestial equator.
- 6. sun-centered
- 8. Relating to intellect.
- 9. An optical instrument used for viewing very small objects.
- 11. having or representing the earth as the center, as in former astronomical system.