Young, Charles A. (Charles Augustus), 1834-1908, Young, Anne Sewell, b. 1871., ed · Boston, New York [etc.] Ginn and Company · leaf 87
the fraction —, t being the number of days since the planet last passed peri-helion, and T the number of days in the whole period. If, for instance, the earth last passed perihelion on Dec. 31st (whichit did), its place on May 1st must be such that the sector A SP will be 121 -—- of the whole of… … 74 CHANGES IN THE EARTHS ORBIT. [§ 120 120. Changes in the Earths Orbit. — The orbit of the earthchanges slowly in form and position, though it is unchangeable(in the long run) as regards the length of its major axis andthe duration of the year. (1) Change in the Obliquity of the Ecliptic. The…
Astronomy · Constellations
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