| 摘要 |
The CCIR,
CONSIDERING
(a) that for dating purposes a decimal day count is desirable in connection with the use of radio time signals and radio time codes;
(b) that a decimal day count with reference to Universal Time, the Julian Date (JD), has long been established for dating in astronomy, chronology and related sciences;
(c) that a decimal day count is necessary, by which the start of a day is defined at 0000 hours and not at 1200 hours as in the case of the Julian Date;
(d) that a decimal day count is necessary, in particular in association with the time scales UTC and TAI;
(e) that it is necessary to avoid a proliferation of different dating systems;
(f) that a simple change from the Julian Date mentioned above to a modern decimal day count would be advantageous;
(g) that the existing and established Julian Date, based on the start of the day being Greenwich Mean Noon, should be continued without break;
(h) that a Modified Julian Date (MJD), which meets the requirements stated above, is already in use |
PDF(76M) 
您当前的位置：
ITU-R ITU无线标准