A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 279
ld fallnearly straight downwards. If theearth were concentrated at the pointin its centre so that the body shouldnot strike its surface, it would movein a very long narrow ellipse havingthe centre of the earth at the furtherfocus, and would return to the original point after an interval of 29.9… … Fig. 140. — Projectiles near the Earth. EXPRESSION FOR a. 267 the body would be a perfect circle, and the period would be 1 h. 24.7 m. Itwill be remembered that we found that if the earths rotation were 17 timesas rapid, thus completing a revolution in lh 24m.7, the centrifugal forceat the equator…
Astronomy
Internet Archive · Wellesley College Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer01inte-402-156.webp)
