Astronomy Without a Telescope: A Guide to the Constellations, and Introduction to the Study of the Heavens With the Unassisted Sight (Classic Reprint) - Tapa dura

Sinopsis

Excerpt from Astronomy Without a Telescope: A Guide to the Constellations, and Introduction to the Study of the Heavens With the Unassisted Sight

HE last quarter of a century has seen a striking increase in the size and efficiency of astronomical telescopes. These have opened. Up new fields of great interest; but in the widespread attention which they have attracted there is some danger lest it should be forgotten that there are fields for which the primary instrument of all, the unassisted human eye, is still available, and to which it alone is adapted, fields which even yet are far from being exhausted.

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