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Excerpt from Half-Hours With the Stars: A Plain and Easy Guide to the Knowledge of the Constellations, Showing, in Twelve Maps, the Position for the United States of the Principal Star Groups Night After Night Throughout the Year; With Introduction and a Separate Explanation of Each Map, True F
But although this illustration serves to indicate the nature Of the maps, the actual mode of using them is more convenient.
Let it first be noted that properly speaking the maps have neither top, bottom, nor sides. Each map may be held with any part of the circumference downward then the centre of the map is to be looked upon as the top for that part of the circumference. The portion Of the map lying beneath the centre represents the portion of the sky lying between the point overhead and a certain part of the horizon - the part in fact corresponding to the particular part of the circum ference which is turned downwards. Thus if on any night we wish to learn what are the stars towards the north, we look for the map corresponding to that night. At the hour named the stars toward the north will be those shown between the centre Of the map and the top; and, of course.
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