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 156
he orbit, andSME a rightangle. It will be obvious that M E S, the angle of extreme elongation,will be at its maximum when S E is the shortest and S M the longest; andat its minimum when these are reversed; because its size depends upon Questions.—206. How are Mercury and Venus known to be inferior… … the ratio of S M to S E, being greatest whenthe ratio is greatest. The perihelion dis-tance of the earth is about 90,000,000 miles,the aphelion distance of Mercury is about42,600,000 miles. For these values the ratioof S M to S E would be about .473 ; and theangle corresponding to this is 28° IS.…
Astronomy
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