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Diffstat (limited to 'math/slalib/doc/djcal.hlp')
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diff --git a/math/slalib/doc/djcal.hlp b/math/slalib/doc/djcal.hlp new file mode 100644 index 00000000..d65c81bd --- /dev/null +++ b/math/slalib/doc/djcal.hlp @@ -0,0 +1,38 @@ +.help djcal Jun99 "Slalib Package" +.nf + + SUBROUTINE slDJCA (NDP, DJM, IYMDF, J) + + - - - - - - + D J C A + - - - - - - + + Modified Julian Date to Gregorian Calendar, expressed + in a form convenient for formatting messages (namely + rounded to a specified precision, and with the fields + stored in a single array) + + Given: + NDP i number of decimal places of days in fraction + DJM d modified Julian Date (JD-2400000.5) + + Returned: + IYMDF i(4) year, month, day, fraction in Gregorian + calendar + J i status: nonzero = out of range + + Any date after 4701BC March 1 is accepted. + + NDP should be 4 or less if internal overflows are to be avoided + on machines which use 32-bit integers. + + The algorithm is derived from that of Hatcher 1984 + (QJRAS 25, 53-55). + + P.T.Wallace Starlink 27 April 1998 + + Copyright (C) 1998 Rutherford Appleton Laboratory + Copyright (C) 1995 Association of Universities for Research in Astronomy Inc. + +.fi +.endhelp |