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| | CHAPTER I. |
 | | The eclipse of December, 1870, decided one point, that the corona was a truly solar phenomenon, and not, as some astronomers imagined, an optical phenomenon, produced by our own atmosphere. |
 | | Dependent, as it is almost entirely, upon mechanical and optical aid, every improvement and discovery in these departments changes its position, bringing to light new facts, and modifying the aspect of those which were previously known. |
 | | In addition to this, many stars of very different magnitudes are found to be related to each other in such a way as to show that they are in actual, and not merely in optical proximity. |
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