THE NAUTICAL ALMANAC

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Page 220 - December 37 for the sake of convenience. This inclination is ever varying, as well from the effect of its mean diminution, as of the nutation of the earth's axis: it is an important element in deducing the positions of...
Page 206 - The Sidereal Time of the Sun's Semidiameter passing the Meridian is useful for reducing a transit observation of either limb of the Sun, when one only has been observed, to the transit of the centre. The Equation of Time is the difference between apparent and mean time, and therefore serves for the conversion of cither time into the other.
Page 49 - Shadow occurs at 124 from the Northernmost point of the Moon's limb towards the East. The last contact 82 towards the "West ; in each case, for direct image.
Page 208 - Sidereal Time at Mean Noon is the angular distance of the first point of Aries, or the true vernal equinox, from the meridian, at the instant of mean noon : it is therefore the Right Ascension of the mean Sun, or the time shown by a sidereal clock at Greenwich, when the mean time clock indicates oh om o*.
Page 213 - Moon and certain heavenly bodies, such as they would appear to an observer at the centre of the Earth. When a Lunar Distance has been observed on the surface of the Earth, and...
Page 208 - Noon is the angular distance of the first point of Aries, or the true vernal equinox, from the meridian, at the instant of mean noon : it is therefore the Right Ascension of the mean Sun, or the time which ought to be shown by a sidereal clock at Greenwich, when the mean time clock indicates oh om os.

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