Re: OT: Celestial maps

Den 12. jan. 2008 kl. 20.23 skreiv Mark J. Reed:

> Exactly when that year was depends on what you're talking about.  We
> currently use the Gregorian calendar, and sometimes astronomers extend
> it backwards well before its inception in 1582 to refer to past dates.
>  But usually dates before then are given in the Julian calendar,
Astronomers used to reckon time in Julian days, before and after
1582. Has that changed in later years?

LEF

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