By James A. Van Allen
Ebook by way of Van Allen, James A.
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Additional info for 924 elementary problems and answers in solar system astronomy
316. Suppose that the Moon were a thin circular disk (rather than a sphere) that continuously faced the Earth. Describe how the Moon would appear to an Earth observer at the following phases: (a) new Moon; (b) 5 days after new Moon; (c) 9 days after new Moon; (d) 14 days after new Moon. 317. , the interval of time between successive meridian transits of the Sun as observed by an astronaut on the Moon? Page 44 318. Describe the phases of the Earth as they would appear to an observer on the Moon.
278. If the Moon revolved around the Earth in the same sense that it now does but with a sidereal period of 91 days, its synodic period (interval between successive new Moons) would be about (a) 121; (b) 182; (c) 73; (d) 274 days. 279. , were perfectly black), its presence would be revealed by a number of observable effects. Name at least three. 280. The Moon is said to be a triaxial body. What does this mean? 281. The classical method for determining the ratio of the mass of the Moon to the mass of the Earth depends upon observing (a) the apparent monthly wavering of the orbits of asteroids passing nearby; (b) the parallax of the Moon as viewed against the star field from different points on the Earth's surface; (c) the difference between the sidereal and synodic months; (d) the eccentricity of the Moon's orbit.
How can a radar be used to determine the absolute value of the astronomical unit? 168. By observing the motion of Saturn relative to the star field over a period of many years, it is found that its average motion is (a) eastward by about 6 degrees per year; (b) westward by about 12 degrees per year; (c) eastward by about 12 degrees per year; (d) westward by about 6 degrees per year. 169. Sketch the configuration of the Sun, the Earth, and Venus when the latter is at greatest elongation East. Page 25 170.
924 elementary problems and answers in solar system astronomy by James A. Van Allen