924 elementary problems and answers in solar system by James A. Van Allen

By James A. Van Allen

Booklet by way of Van Allen, James A.

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0 days. The radius of the Moon's orbit is 60 Earth radii. 134. 3 AU. When did it reach perihelion for the first time? 135. 6 years. What is the semimajor axis of its elliptical orbit about the Sun? 136. 44 AU. What is its sidereal period of revolution about the Sun? 137. Estimate the orbital period of a spacecraft whose perihelion is at the Earth's orbit and whose aphelion is at Mars' orbit. 138. 5 AU. Calculate its sidereal period of revolution about the Sun by comparison with that of the Earth, using Kepler's third law.

What is the phase of the Moon as seen from the Earth? 313. An astronaut at the center of the Moon's face (as seen from the Earth) observes the Sun on the western horizon. Therefore, the phase of the Moon (in Earth observer's terms) is (a) last quarter; (b) full; (c) new; (d) first quarter. 314. A photograph of the Moon shows one portion dark and the remainder bright. How can one distinguish between a phase of the monthly cycle and a partial eclipse? 315. Even during a total eclipse of the Moon by the Earth, the Moon can be seen faintly illuminated.

Hence the phase of the Moon is (a) first quarter; (b) last quarter; (c) new; (d) full. 312. An astronaut standing on the northern pole of the Moon and looking toward the Earth notes that the Earth is in the waxing crescent phase. What is the phase of the Moon as seen from the Earth? 313. An astronaut at the center of the Moon's face (as seen from the Earth) observes the Sun on the western horizon. Therefore, the phase of the Moon (in Earth observer's terms) is (a) last quarter; (b) full; (c) new; (d) first quarter.

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