| Julian Date stamp, for high precision calculations. Julian date is a real
number and it basicly consist of two parts: integer and fraction. Integer
part carries date information, fraction carries time information.
The Julian day or Julian day number (JDN) is the (integer) number of days that
have elapsed since Monday, January 1, 4713 BC in the proleptic Julian calendar 1.
That day is counted as Julian day zero. Thus the multiples of 7 are Mondays.
Negative values can also be used.
The Julian Date (JD) is the number of days (with decimal fraction of the day) that
have elapsed since 12 noon Greenwich Mean Time (UT or TT) of that day.
Rounding to the nearest integer gives the Julian day number.
For calculations that will have time precision of 1e-3 seconds, both
fraction and integer part must have enough numerics in it. The problem is
that integer part is big and, on the other hand fractional is small, and
since final julian date is a sum of this two values, some fraction
numerals may be lost. Therefore, for higher precision both
fractional and intger part of julian date real number has to be
preserved.
See Also: TimeUtil
See Also: JDateTime
See Also: DateTimeStamp
See Also: todo Add switches to MJD, TJD... |
