no confusion ?

Forums Variable Stars Error in ASIIMG FITS header no confusion ?

Robin Leadbeater

Nick said “The FITS “standard” is irritatingly vague about things like this ..”

According to this document, in 1997 the IAU recognised this confusion and standardised DATE-OBS as the start time

 “4.2) Henceforth, DATE-OBS shall be assumed to refer to the start of an

observation. Other interpretations must be clearly explained in the comment field.”