A beginner's star-book; an easy guide to the stars and to the astronomical uses of the opera-glass, the field-glass and the telescope . n their January, at the same hour, we shall find them, accordingly, too high overhead for con-venient observation; but by April 1st, we shall again find them conveniently placed forobservation at the northwest. As the stars make the complete circle of their apparentrevolution once in every twenty-four hours, we can anticipate this yearly march throughthe months—if we desire—by watching out the night. The suns shining will of coursemake them invisible by
A beginner's star-book; an easy guide to the stars and to the astronomical uses of the opera-glass, the field-glass and the telescope . n their January, at the same hour, we shall find them, accordingly, too high overhead for con-venient observation; but by April 1st, we shall again find them conveniently placed forobservation at the northwest. As the stars make the complete circle of their apparentrevolution once in every twenty-four hours, we can anticipate this yearly march throughthe months—if we desire—by watching out the night. The suns shining will of coursemake them invisible by day, but we may be quite sure that the Pleiades are actually in * Many a night from yonder ivied casement, ere 1 went to I look on great Orion, sloping slowly to the a night I saw the Pleiads, rising thro the mellow shade,GHtter like a swarm of fireflies tangled in a silver braid. Tennyson: Lockslev Hall. i8 a BeQinner0 Star^Book our sky—at all seasons of the year—about i6 hours out of every 24. The watching ofsuch a group for a few nights, not out of a window but under the actual sky, will, in itself,. LARGER STARS IN CLUSTER OF THE PLEIADES [For view at culminalion, the side to readers right should be held downward)From a photograph taken at the Yerkes Observatory prove a good beginning in astronomy and will do more to make clear the apparent motionof the stars than any amount of theoretic description. (See also pp. 22 and 24.) I say Cbe Stellar Morlb 19 apparent motion, because of course the movement of the stars, in the sense in whichI have here employed the word, is not real. It is our earth that really moves. Let us assume that about October ist we are looking at the northeast (nearer eastthan north), and that at 8 p. M. we discern the five or six brighter stars of the Pleiades justrising above the horizon; at 9 p. M. they will be higher still. Indeed, if the horizon is shutoff by high woods or tall buildings, or by clouds or fog, we may have t
Size: 1252px × 1995px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade19, booksubjectastronomy, bookyear1912
