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 195
en the Earth andthe Sun) at the time of the eclipse. Now we willgo to work, according to your calculated elements. Make a scale, as y A t? (PLATE VII. Fig. 1.)almost half the length of the paper intended foryour projection, and divide it into 60 equal partsat least, reckoning each part to be one… … It c ond s (or 5 31-,) fro m th e s i o y o u r c o m I with that extent, set one foot in the end Cscale as a centre ; and with the other foot dies-bribe the semicircle, AD B for the circumfcrer.f the northern half of the Earths iliuminat: or surface, because v re on the north sideof the Equator:…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
