 The civil day begins twelve hours before the astronomical day; therefore the first half of the civil day corresponds to the last half of the preceding astronomical day, and the last half of the civil day coincides with the first half of the astronomical...  The American Ephemeris and Nautical Almanac - Page 698by United States Naval Observatory. Nautical Almanac Office - 1911Full view - About this book
 | 1900 - 662 pages
...time may be either apparent or mean, according as it is reckoned from apparent noon or from mean noon. The civil day begins twelve hours before the astronomical...date. Thus, January 9, 2 o'clock, AM, civil time, is January 8, 14'', astronomical time; and January 9, 2 o'clock, PM, civil time, is also January 9, 2h,... | |
 | 1907 - 294 pages
...time may be either apparent or mean, according as it is reckoned from apparent noon or from mean noon. The civil day begins twelve hours before the astronomical...date. Thus, January 9, 2 o'clock, AM, civil time, is January 8, i4h, astronomical time; and January 9, 2 o'clock, PM, civil time, is also January 9, 2h,... | |
 | United States Naval Observatory. Nautical Almanac Office - 1915 - 798 pages
...twelve hours before the astronomical day; therefore the first half of the civil day coincides with the last half of the preceding astronomical day, and...first half of the astronomical day of the same date. Hence we have the following rules: To convert Oivil Time into Astronomical Time. — If the civil time... | |
 | 1912 - 554 pages
...of the same date, the 24 hours being counted from о to 24, running from noon of one day to noon of the next following day. Astronomical time as well...date. Thus, January 9, 2 o'clock AM, civil time, is January 8, i4h, astronomical time; and January 9, 2 o'clock PM, civil time, is January 9, 2h, astronomical... | |
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