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 (1912)
Murphy, Edgar Gardner, 1869-1913 · New York, London, G.P. Putnam's sons · leaf 71
-piece of high power, and the beginner may need atelescope of larger size, three and one-(iuartcr to threeand three-quarter inches of aperture, for its division.The contrast in the colors of the components is very fine.Polaris, the Pole-Star [406], can be divided by a three-inch instrument, with an… … NIGHT-CHART TO THE SKY AS THE OBSERVER FACES SOUTH.SEPT. 1, 8 P.M., AUG. 15, 9 P.M., AUG. 1, 10 P.M., JULY 15, 11 P.M., JULY 1, 12 P.M. FOR KEY-MAP TO THIS CHART SEE OPPOSITE PAGE. FOR THE SKY AS THE OBSERVER FACES NORTH, SEE PP. 54, 55. For the sky at other Dates and Hours see Time Schedule,^p.…
Astronomy
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