Models of the Universe

3. German astronomer who discovered three major laws of planetary motion
7. Set of thirteen constellations seen along the Sun’s ecliptic path.
8. It is the wobbling of the Earth’s celestial north pole.
10. the square of a planet’s orbital period (years) is proportional to the cube of the semimajor axis of its orbit
11. separates the Eastern and Western Hemispheres and runs through Greenwich, England and is at 0° longitude.
12. the apparent daily motion of stars and other celestial bodies across the sky due to Earth’s rotation
13. an APPARENT change in the movement of the planet through the sky.
15. Occurs when the moon passes between the Earth and sun with the moon casting a shadow on the Earth’s surface.
16. An event in which the sun passes the celestial equator.
19. the point in the path of a heavenly body (as a planet) that is nearest to the sun.

1. a line that circles the Earth halfway between the North and South poles
2. It is a model which deems Earth as the center of the universe.
4. The apparent yearly motion of stars and other celestial bodies across the sky due to Earth’s revolution.
5. the greatest distance between a planet or other body and the Sun
6. a Greek Mathematician, told that no vertical shadow was cast as the sun rays fall vertically in the city of Syene in Egypt during summer solstice.
9. It occurs when the Earth is directly aligned between the sun and moon with the Earth casting a shadow on the moon.
14. A model which deems all planets revolve around the sun
17. The astronomical event in which the sun passes the highest or lowest point from the celestial equator.
18. the force by which a planet or other body draws objects toward its center