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Buglog #216

  • Thursday, May 27 1993 @ 09:01 PM GMT
  • Contributed by:
  • Views: 981
MODULE: noao.astutil.asttimes
SYSTEM: V2.9
NUMBER:	216
MODULE:	noao.astutil.asttimes
SYSTEM:	V2.9
DATE:	Thu May 27 15:01:18 MST 1993
FROM:	valdes

BUG:	The epoch printed is not clearly defined and the siderial time is
	incorrect by a few seconds.  There is also a gross error at the
	new year for observatories with a negative time zone.  The epoch
	used is the day of the year, including the fraction of the day,
	divided by a Julian year of 365.25 days.  However the siderial
	time calculation assumes a J2000 Julian epoch which is not the
	same as the previous definition.  The previous epoch definition
	is also no smoothly continuous at the new year since some years
	have 366 days and other 365 and no years have 365.25 days.
	Other tasks in the ASTUTIL package also use the astronomical
	time routines but it appears that generally the error cancels
	out (because the date->epoch->julian date transformations use
	the same epoch definition) or is insignificant (such as in
	precession or air mass calculations).

STATUS:	For V2.10.3 the routines have been modified to consistently use
	J2000 epochs.  ASTTIMES will print these epochs and the
	sideral times will not have the errors of a few seconds.

NUMBER:	365
MODULE:	apall, apsum
SYSTEM:	V2.10.4
DATE:	Wed Apr  2 12:27:20 MST 1997
FROM:	valdes

BUG:	The 'strip' format option may fail with the error

	    No write permission on file (String_File)

	Unfortunately there is no workaround for this error.
	Contact iraf@noao.edu for a fix.

STATUS:	Fixed for the next release.

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