Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 300
tion Periods ofthe Planets. — The planetS Mercury and Venus have noknown satellites and their masses are subject to some un-certainties. The rotation periods of Mercury and Venusare very much in doubt because of their unfavorable po-sitions for observation, while the distances of Uranus andNeptune… … Fig. 97. — Orbit of the outer planets. what is called irradiation, which makes a luminous objectappear larger than it actually is. The data given in Table V are based partly on Barnardsmany measures at the Lick Observatory, and partly onthose adopted for the American Ephemeris and NauticalAlmanac.…
Astronomy
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