A new manual of the elements of astronomy, descriptive and mathematical .. (1868)
Kiddle, Henry, 1824-1891 · New York, Ivison, Phinney, Blakeman & co.; Chicago, S.C. Griggs & co. · leaf 38
carries. The radius-vector io con-ceived to carry the planet as it moves around in its orbit.t From the Greek pen, meaning around or near ; and helios, the sun.% From apo, meaning/rom, and helios. Apo in combination becomes aph.% Apsis, plural apsides, is from the Greek, and means & joining.… … vector in different positions of the plan-et. The planet moves in its orbit sothat the spaces A S B, B S C, etc., maybe equal, if described in equal times.It has therefore to move much fasterin the perihelion than in the aphelion,since at the former point the spaces pmust be wider in order to make…
Astronomy
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