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 192
of the sun and planets istoo small for the most accurate instruments. Thepassage of Venus over the suns disk was thereforeused by astronomers for settling their distances more accurately. Method of finding the suns distance from the earthby the transit of Venus, as explained by Prof. Dou*class, of… … with its ridit angle at Venus v, one acute angle at theearth e made by a line drawn from the earth to the suns, and another line from the earth to Venus when it is atits greatest apparent distance from the sun : the angle 190 ASTRONOMICAL CALCULATIONS. at the earth may he taken hy the quadrant.…
Physics
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