A Star Atlas for the Library the School And the Observatory Showing 6000 Star
A Star Atlas for the Library the School And the Observatory Showing 6000 Star
Richard a Richard Anthony Proctor
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D. ) are given for any date, even a hundred years before or after the date of the map. Remembering that all the stars are shifting (as respects their R. A. And dec. ) parallel to the arrows, and that the nearest arrow to any star presents the star's precessional motion for 100 years (or, where the arrows differ most in length, that the extent of this motion lies between the lengths of the two nearest arrows), we can at once make any desired correction for precession. Thus, suppose we want to ma...rk in an object whose R. A. And dec. Are given fpr 1840, we find the stated place in the map, and put the star down in advance of that place, in the direction pointed out by neighbouring arrows, and by a distance equal to the length of two divisions out of five on the nearest arrow. And so all objects given for a date preceding 1880 may be marked in. Objects whose places are assigned for dates after 1880 will have to be shifted backwards. In all cases the change of place is parallel to the neighbouring latitude-parallels.
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