Page 415 - 89 history of astronomy_opt

Since the invention of the telescope no
discovery has given so great an impetus to
astronomical physics as the spectroscope;
and in giving us information about the sys-
tems of stars and their proper motions it
rivals the telescope.
Frauenhofer, at the beginning of the nine-
teenth century, while applying Dollond’s dis-
covery to make large achromatic telescopes,
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