An easy introduction to astronomy for young gentlemen and ladies : describing the figure motions, and dimensions of the earth : the different seasons : gravity and light : the solar system : the transit of Venus and its use in astronomy : the moon's motion and phases : the eclipses of the sun and moon : the cause of the ebbing and flowing of the sea, &c. (1812)
Ferguson, James, 1710-1776 · Philadelphia : Johnson and Warner, Ann Cochran, printer · leaf 59
Ihave often seen this experimentally confirmed bya machine called the whirling table* JS. Ill understand this; supposing there are fourplanets so placed, as that the distance of the secondfrom the sun is twice as great as the distance of thefirst; the distance of the third, three times as great;and… … 49 a ninth part of the force; and the second with onlya fourth part of the force that attracts the first. A7. Exactly so. £. I should be glad to know the reason whythe suns attraction decreases in proportion to thesquares of the distances from him. Why do youshake your head ? N. Because you ask me…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
