ASTRONOMY WITH AN OPERA-GLASS. 



189 



on the 1st of August. Remembering that the center of the map is 

 the point over his head, and that the edge of it represents the circle 

 of the horizon, the reader, by a little attention and comparison with 

 the sky, will be able to fix in his mind the relative situation of the 



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various constellations. The maps that follow will show him these con- 

 stellations on a larger scale, and give him the names of their chief stars. 

 The observer need not wait until midnight on the 1st of June in 

 order to find some of the constellations included in our map. Earlier 

 in the evening, at about that date, say at nine o'clock, he will be able 

 to see many of these constellations, but he must look for them farther 

 toward the east than they are represented in the map. The bright 

 stars in Bootes and Virgo, for instance, instead of being over in the 

 southwest, as in the map, will be near the meridian ; while Lyra, in- 

 stead of shining high overhead, will be found climbing up out of the 



VOL. XXXI. 13 



