1. The Chinese recorded a very interesting and powerful cosmic event. What was this event?
		B. Supernova (crab nebula)
	2. What was a common feature of astronomy as practiced worldwide prior to the Greeks?
		A. Recognizing patterns
	3. What did Eratosthenes measure very accurately?
		B. The size of the earth
	4. Who were the two great authorities of Greek astronomy?
		A. Aristotle and Ptolemy
	5. Which of the following statements reflects beliefs that were almost universally held in pre-Copernican astronomy?
		C. Earth was at the centre of the universe
	6. In what circumstances is retrograde motion observable?
		A.  it is observable for all planets
	7. You are observing the night sky from Mars. In what circumstances is retrograde motion observable?
		D. It is observable for all planets
	8. (something retrograde motion)
	9. What is parallax
		C. The apparant motion of an object due to the motion of the observer
	10. What was the reason for using epicyvles and deferents to explain the motion of the planets in the night sky?
		A. Retrograde motion
	11. The copernican system was no more accurate than the ptolemaic system  in predicting the positions of the planest because of a...
		C. Sun...
	12. Ptolemy formulated a(n) [geocentric] model of the solar system to predict positions of the sun, moon and planets
		- [geocentric]
	13. According to keplers thrid law, a planets orbital period [] is equal to it saverage distance from the sun [semi major axis distance - > cubed]
	14. The coperinican model of the solar system has the planets orbiting the sun along elliptical paths
		F. False
	15. Many classical Greek astronomers believed the Earth could not move because they deteteced no parallax
		T. True
	16. The ptolemiac model of the unverse was heliocentric
		F. False (Geocentric)
	17. Classical Greek astronomers believed the motions of the heavens could be described by uniform circlar motion.
		T. True