The elements of theoretical and descriptive astronomy, for the use of colleges and academies (1872)
White, Charles J. (Charles Joyce), 1839-1917 · Philadelphia, Claxton, Remsen & Haffelfinger · leaf 96
s that the distance between the earth and the sun also variesduring the year, being greatest when the suns semi-diameter isthe least, and least when it is the greatest. The truth of this -inclusion may be seen in Fig. 37, in which we have sin AES = jro- As AS of course remains constant, ES will… … 90 ORBIT OF THE EARTH. is 15 45.5: hence the ratio of the greatest to the least distanceis that of 16 17.8 to 15 45.5, or of 1.034 to 1. Let us now assume any line, SA in Fig. 39, for instance, as ourunit of measure, and prolong it untilSH is to SA as 1.034 is to 1. Then if Sdenotes the sun, SA and…
Astronomy
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