A system of astronomy; on the principles of Copernicus - Tapa blanda

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1827 Excerpt: ...accelerated or retarded about one hundred years by the irregular motion of the earth and moon. An eclipse may visit the earth but 70 times in one series. It will not surpass 77 times. In the one case it will occupy about 1262 years; in the other about 1388 To find how many times an eclipse will happen in the same course, divide twice the eclipt c limit reduced by 28' 12 ". The ecliptic limit varies as we have seen, from 16 28' to '18 11'. The long interval after an eclipse has left the earth, till it will again return, may be found by subtracting twice the ecliptic limit from 360, dividing the remainder by 28' 12", and multiplying the quotient by 18y. lOd. 23h. 3m. 51s. the time intervening between returns. The memorable eclipse of June 16, 1806, total to a large part of New-England, happened at the moon's descending node. This eclipse traversed the expansum from the creation till the year 1049, when on the 6th of March, 0. S. at lOh. 11m. 39s. in the morning,it first met the south pole. It has been moving farther north at each return to the present time. It will make its next visit on the 26th of June, 1824, at 6h. 41m. 10s. in the evening-! The extreme circle of the » To bi,ihg these calculations to the meridian of Boston, where the eclipse was total, acid 23m. 26s. t Calculated before the year 1824., penumbra touching Boston just as the sun sets, the eclipse will be scarcely visible in New-England. At the city of Washington, the sun will go down partially eclipsed. The dark shadow, after passing over an immense tract of he Pacific ocean, will approach the western shores of North America, and, coasting majestically along by New Albion, California, and other Spanish provinces, will set near Acapulco in Mexico. The next return of this eclipse...