Lessons in astronomy including uranography. A brief intoductory course without mathematics (1896)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston, London, Ginn and company · leaf 16
eet or inches. To saythat two stars are about five feet apart, for instance, — and itis not very uncommon to hear such an expression, — meansnothing unless we know how far from the eye the five-footmeasure is to be held. The proper units for expressing appar-ent distance in the sky are those of… … Fig. 1. 1 This is the same as the vanishing-point of perspective. 6 CIRCLES OF THE CELESTIAL SPHERE. [§ 8 or Dipper-handle, is about 16° long, and the long side of theDipper-bowl is about 10°; the moon and the sun are eachabout half a degree, or 30 , in diameter. It is very important that the…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
