A high-school astronomy: in which the descriptive, physical, and practical are combined .. (1859)
Mattison, Hiram, 1811-1868 · New York, Mason brothers · leaf 60
93. What is meant by the mean place of a planet ? The true place ? (When DIKECT AND RETROGRADE MOTIONS. 55 DIRECT AND RETROGRADE MOTIONS. … 2. From the perihelion to the aphelion, it will be seen that the true place is in ad-vance, or eastward, of the mean place ; while from aphelion to perihelion again, themean place is in advance of the true. But at the perihelion and aphelion points,themean and true places coincide. 3. In one…
Astronomy
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