An astronomical dictionary; compiled from Hutton's Mathematical and philosophical dictionary to which is prefixed an introduction containing a brief ... illustration of its elementary principles - Softcover

Inhaltsangabe

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. 1817 Excerpt: ...which turn round till its edge cut the given longitude on the ecliptic; then count the given latitude, from the ecliptic, upon the quadrant of altitude, and there make a mark on the Globe, which will be the place of the planet, &c. sought. The place on the Globe, of any such planet, &c. being found by this or the foregoing problem, its rising, or setting, or any other circumstance concerning it, may then be found, the same as the sun, by the proper problems. XXIII. To find the rising, setting, and culminating of a star, planet, sun, fyc.; with its continuance above the horizon, for any place and day; as also its oblique ascension and descension, with its eastern and western amplitude and azimuth.--Adjust the Globe to the state of the heavens at 12 o'clock that day. Bring the star, sing, as for the sun. Again, turn the globe to bring the same star to the western side of the horizon t-W$ will the western amplitude and azimuth, with the time of setting, be found. Then, the time of rising, subtracted from that of setting, leaves the continuance of the star above the horizon; this continuance above the horizon taken from 24 hours, leaves the time it is below the horizon. Lastly, bring the star to the meridian, and the hour to which the index then points is the time of its culmination or southing. XXIV. To find the altitude of the sun, or star, fyc. for any given hour of the day or night.--Adjust the Globe to the position of the heavens, and turn it till the index point at the given hour. Then fix on the quadrant of altitude, at 90 degrees from the horizon, and turn it to the place of the sun or star: so shall the degrees of the quadrant, intercepted between the horizon and the sun or star, be the altitude sought. XXV. Given the altitude of the sun by day...

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