Page:Sir William Herschel, his life and works (1881).djvu/190

This page has been validated.
168
Life and Works
Order of
Distance.
Number of
Stars there is
Room for.
Magnitude. Number of
Stars of that
Magnitude.
1........ 26 1 17
2........ 98 2 57
3........ 218 3 206
4........ 386 4 454
5........ 602 5 1,161
6........ 866 6 6,103
7........ 1,178 7 6,146
8........ 1,538


The result of this comparison is, that if the order of magnitudes could indicate the distance of the stars, it would denote at first a gradual and afterward a very abrupt condensation of them, at and beyond the region of the sixth-magnitude stars.

If we assume the brightness of any star to be inversely proportional to the square of its distance, it leads to a scale of distance different from that adopted by Herschel, so that a sixth-magnitude star on the common scale would be about of the eighth order of distance according to this scheme—that is, we must remove a star of the first magnitude to eight times its actual distance to