Philosophical instructor, or, Webster's elements of natural philosophy : subdivided into principles and illustrations ; intended for academies, medical schools, and the popular class-room (1824)
Eaton, Amos, 1776-1842, Webster, John, fl. 1804-1824 · Albany : Printed by Websters and Skinners ... · leaf 191
a right angle; a e is theknown semi-diameter of the earth. This exhibitswhat is called the moons horizontal parallax. Nowif we had the angle c at the moon, we could constructthe triangle, and measure the line e c by the scale bywhich the line a e was laid down, which would be thedistance from the… … ASTRONOMICAL CALCULATIONS. 189 being to find the acute angle at e, we must proceed asfollows : Find the time required for the moon to per-form its apparent revolution round the earth : one-fourth of this time is required for its apparent progressfrom o to i, the rational horizon. By…
Physics
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