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Re: Problems with JULDAY and CALDAT [message #14957 is a reply to message #14831]

Fri, 09 April 1999 00:00

Struan Gray
Messages: 178
Registered: December 1995

Senior Member

William Thompson, thompson@orpheus.nascom.nasa.gov writes:

> But then, we didn't have a whole lot of satellites
> up prior to 1583 (that I know about). ;^)

You probably know this, but in case anyone is tempted to relate,
say, Kepler's planetary observations to more modern ones it is
necessary to bear in mind that:

a) Not all European countries changed calanders in the same year.

b) At that time, the 'year' did not necessarily change on the
night of Dec31/Jan1 - and the change day could also be
different for different countries. Within one country this
can vary with the type of record - rather as if modern
fiscal years were recorded using only the start year so that
Feb '99 becomes Feb '98.

There are books with tables that will let you calculate the 'date'
for any given day in any given country, but with published records you
need to do a bit of archival digging to find out if the published date
uses the calander of the author, his sponsor or the publisher - all
three could in theory be different - and with private letters all bets
are off.

Struan

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[Message index]

		Problems with JULDAY and CALDAT By: John J. Boia on Wed, 07 April 1999 00:00
		Re: Problems with JULDAY and CALDAT By: Struan Gray on Fri, 09 April 1999 00:00
		Re: Problems with JULDAY and CALDAT By: thompson on Thu, 08 April 1999 00:00
		Re: Problems with JULDAY and CALDAT By: Dr. G. Scott Lett on Wed, 07 April 1999 00:00

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