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The Nautical Almanac and Astronomical Ephemeris for the Year 1828.

The Nautical Almanac and Astronomical Ephemeris for the Year 1828. by Commissioners Of Longitude, ISBN: 9781130662702
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ISBN: 9781130662702
Publisher: Rarebooksclub.com, United States
Published: March 2012
Format: Paperback
Editions: 440 other editions of this product

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The Nautical Almanac and Astronomical Ephemeris for the Year 1828.

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. 1825 Excerpt: ...from Noon being subtracted, leaves the correct Time of the Star's passing the Meridian. Hence the apparent Time may be found from an observed Altitude of a known fixed Star, suppose one contained in Page 7, of the Requisite Tables, as will be explained hereafter. The Sun's right Ascension in Time is also useful for computing the Time of the Moon and Planets' passing the Meridian, as will be shown under their proper Articles.-.. The Sun's Declination is necessary to find the Latitude, whether at Sea or Land, from the Meridian Altitude observed: it is also requisite for finding the Latitude from Two Altitudes observed, with the Interval of Time measured by a watch; it serves for computing the Sun's Azimuth, having his Altitude and the Latitude of the Place given, in order to find the Variation of the Compass; it is required, jointly with the Latitude of the Place and the Sun's horary Angle, to compute his Altitude if neglected to be observed at the time of taking the Moon's Distance from the Sun for finding the Longitude, being useful to facilitate the Calculations of the Effect of Refraction and Parallax upon the Distance; it is also necessary to calculate the apparent Time from an observed Altitude of the Sun at a Distance from the Meridian, the Latitude being given; or to compute the Time of the Sun's Setting or Rising; which, though a less accurate Method than the former of obtaining the Time, may yet be useful when that cannot be had. For any of these purposes the Sun's Declination must be found to the Time, given nearly, reduced to the Meridian of Greenwich, making Proportion according to the Daily Increase or Decrease, in like Manner as was shown with respect to the Sun's Longitude.. The Equation of Time 9 a Correction, which added to, or ...

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