| 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... | |
| 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... | |
| 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:... | |
| Thomas Jefferson Lee - Astronomy - 1853 - 268 pages
...mean solar day be taken equal to 24 mean solar hours, the sidereal day will be equal to 23h 56m 04s.09 of those solar hours, or the daily retardation of...or common method of reckoning, the day is supposed lo com mence at the preceding midnight. The civil reckoning is therefore 12 hours in advance of the... | |
| United States. Army. Corps of Engineers - 1853 - 276 pages
...04'. 09 of those solar hours, or the daily retardation of mean solar on sidereal time is 3m 55'.9093 of solar time. The astronomical day begins at noon....or common method of reckoning, the day is supposed lo commence at the preceding midnight. The civil reckoning is therefore 12 hours in advance of the... | |
| Thomas Jefferson Lee - Astronomy - 1853 - 288 pages
...solar day be taken equal to 24 mean solar hours, the sidereal day will be equal to 23h 56- 04'. 09 of those solar hours, or the daily retardation of mean solar on sidereal time is 3m 55'.9093 of solar time. The astronomical day begins at noon. In the civil or common method of reckoning,... | |
| 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.... | |
| Thomas Jefferson Lee - Astronomy - 1873 - 334 pages
...the mean solar day be taken equal to 24 mean solar hours, the sidereal day will be equal to 23U 56" 48.09 of those solar hours, 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 of reckoning,... | |
| Henri Barré (prof. at Nancy.) - 1873 - 334 pages
...mean solar day be taken equal to 24 mean solar hours, the sidereal day will be equal to 2311 56m 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. In the civil or common method of reckoning,... | |
| 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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