Question about a fits header

[Rob Seaman]

Bill Thompson writes:

> Note, by the way that there isn't any ambiguity about an ISO-8601 entry
> such as
> 
> 	DATE_OBS= "1996-09-04T14:41:57.000Z"

Um - is that the beginning, middle or end of the exposure?
Topocentric or barycentric?


Rob :-)
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