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" Greenwich mean time, and is continued through the 24 hours, to the following mean noon, when another day begins. It may therefore be called the mean astronomical day, although, in practice, astronomers begin the day at the moment the true Sun's centre... "
A Collection of Tables and Formulæ Useful in Surveying, Geodesy and ... - Page 140
by Thomas Jefferson Lee - 1853 - 242 pages
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The Nautical Magazine: A Journal of Papers on Subjects Connected ..., Volume 30

Naval art and science - 1861 - 736 pages
...is used showing Oh. Om. Os., how is the day of the month fixed? 2nd.— Definition of Civil Time. " In the civil or common method of reckoning, the day...is supposed to commence at the preceding midnight." — NA p. 510. There is no occasion for supposing the commencement of the civil day, as every one knows...
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The Nautical Almanac and Astronomical Ephemeris for the Year ...

Ephemerides - 1843 - 634 pages
...although, in practice, astronomers begin the day at the moment the true Sun's centre is on their meridian. In the civil, or common, method of reckoning, the day is supposed to commence ü the preceding midnight, and to be counted only to 1 2 hours or noon, when the 1Î boon are reckoned...
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The Nautical Almanac and Astronomical Ephemeris

Great Britain. Nautical Almanac Office - 1852 - 676 pages
...although, in practice, astronomers begin the day at the moment the true Sun's centre is on their meridian. In the civil, or common, method of reckoning, the...is supposed to commence at the preceding midnight, and to be counted only to 12 hours or noon, when the 12 hours 1 2h in advance of the astronomical reckoning:...
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The Nautical Almanac and Astronomical Ephemeris for the Year ...

Ephemerides - 1860 - 568 pages
...although, in practice, astronomers begin the day at the moment the true Sun's centre is on their meridian. In the civil, or common, method of reckoning, the...is supposed to commence at the preceding midnight, and to be counted only to 12 hours or noon, when the 12 hours are reckoned over ngain to the next midnight....
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Professional Papers of the Corps of Engineers of the United States Army

United States. Army. Corps of Engineers - Military engineering - 1873 - 350 pages
...48.09 of those solar hours, or the daily retardation of mean solar on sidereal time is 3m 55s-9093 of solar time. The astronomical day begins at noon....astronomical reckoning, and in the above example, July 1oth, 12h 27™ 239.66 astronomipal time, corresponds to July nth, o'' 27™ 23S.66 am civil time....
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Tables and Formulae Useful in Surveying, Geodesy, and Practical Astronomy ...

Thomas Jefferson Lee - Astronomy - 1873 - 334 pages
...or the daily retardation of mean solar on sidereal time is 3m S5"-993 f solar time. The astronomifal day begins at noon. In the civil or common method...civil reckoning is therefore 12 hours in advance of the.astronomical reckoning, and in the above example, July loth, i2h 27" 23a.66 astronomical time,...
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Manuel d'arpentage et de lever des plans

Henri Barré (prof. at Nancy.) - 1873 - 334 pages
...4'.09 of those solar hours, or the daily retardation of mean solar on sidereal time is 3m 55"-9o93 of solar time. The astronomical day begins at noon....preceding midnight. The civil reckoning is therefore 1 2 hours in advance of the astronomical reckoning, and in the above example, July roth, 12h 27™...
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The Nautical Almanac and Astronomical Ephemeris for the Year ...

Nautical almanacs - 1853 - 664 pages
...although, in practice, astronomers begin the day at the moment the true Sun's centre is on their meridian. In the civil, or common, method of reckoning, the...is supposed to commence at the preceding midnight, and tobe counted only to 12 hours or noon, when the 12 hours ure reckoned over again to the next midnight....
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