sentials of Astronomy in twelve lessons for amateurs, will not make astronomers or mathematicians of my readers--much less prigs or pedants. They are designed to show the constitution of the Universe, in its grandeur and its beauty, so that, inhabiting this world, we may know where we are living, may realize our position in the Cosmos, appreciate Creation as it is, and enjoy it to better advantage. This sun by which we live, this succession of months and years, of days and nights, the apparent motions of the heavens, these starry skies, the divine rays of the moon, the whole totality of things, constitutes in some sort the tissue of our existence, and it is indeed extraordinary that the inhabitants of our planet should almost all have lived till now without knowing where they are, without suspecting the marvels of the Universe.
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For the rest, my little book is dedicated to a woman, muse and goddess--the charming enchantress Urania, fit companion of Venus, ranking even above her in the c