[net.astro] Julian day/calendar info needed

jwp@uwmacc.UUCP (Jeffrey W Percival) (12/10/85)

I am trying to make the connection between a known
Julian day number (today, say) and the advertised
"day 0", Jan 1 4713 BC.  That is, starting from
today, what considerations are necessary when counting
down through all the years to 4713 BC?  Do I skip
the year 0?  What about 1752, the year of the great
calendar switch (355 days?)?  Do BC leap years work
the same way as AD years (e.g. 4,8,12,... BC = 366 days)?

I don't need source code for any algorithms, just the info.
Thanks!
-- 
	Jeff Percival ...!uwvax!uwmacc!jwp