Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 106
irclesaround the north pole ofthe,sky as a center. Two hours of observation of the posi-tion of the Big Dipper will show the character of the motionvery clearly. Figure 25 shows circumpolar star trails securedby pointing a fixed telescope toward the pole star and givingan exposure of a little over… … Fig. 24. —• Star trails of brighter starsin Orion (Barnard). 78 AN INTRODUCTION TO ASTRONOMY [ch. hi. 39 the northern sky will show that most of the stars whosetrails are seen are quite invisible to the unaided eye. Since all the heavenly bodies rise in the east (except thoseso near the pole that…
Astronomy
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