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Page 51 374. What is the relative tide-raising effectiveness of the Sun to that of the Moon? For this approximate calculation assume that the Earth is 80 times more massive than the Moon, and 300,000 times less massive than the Sun and that the Sun is 400 times more distant than the Moon. 375. Sketch the geometric relationship of the Sun, Moon, and Earth at the time of a total eclipse of the Sun. 376. At what phase must the Moon be in order that it be eclipsed by the Earth? 377. A total eclipse of the Sun by the Moon occurs only at (a) first quarter Moon; (b) last quarter Moon; (c) full Moon; (d) new Moon.

Explain in a few words why this fact alone shows that the Moon is the principal cause of the tides. 368. All but one of the following are attributed to tidal forces and/or tidal torques: (a) Kepler's laws of planetary motion; (b) precession of the rotational axis of the Earth; (c) the fact that the same face of the Moon is always toward the Earth; (d) the rings of Saturn. 369. High tide in the New York harbor occurred at 21h 30m on 9 October. On 12 October a high tide can be anticipated at (a) 11h 35m; (b) 23h 10m; (c) 14h 35m; (d) 09h 05m.

The three-day old Moon (waxing crescent) is best observed (a) at about midnight; (b) soon after sunrise; (c) in the early evening after sunset; (d) in the early morning before sunrise. 301. The last quarter Moon rises at about the following local time (a) 06h; (b) midnight; (c) 18h; (d) noon. 302. " Page 42 303. A northern hemisphere observer reported seeing the full Moon rise at about local midnight. The observer (a) could have been correct if near the equator; (b) could have been correct if on the Tropic of Capricorn; (c) was mistaken, irrespective of location and the time of year; (d) could have been correct if in the arctic.

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