Re: What'a julian day?
On Wed, 25 Jun 1997 11:28:04 +0000 Ralf ieuwenhuijsen
<nieuwen at magigimmix.xs4all.nl> writes: What'a julian day?
>I saw a program to calculate the julian date on the ftp site, but
>what is it?
>
>Will someone please tell me ?
I saw Mr. Gay's reply to your message in this e-mail download. It is
correct as far as "common" use of the term Jullian Date goes but it is
the answer for "Julian Notation" which is good for 10 years in five digit
form. It is useful for calculation of the number of days between two
dates fairly close together.
"Julian Period Date" is the system used by astronomers for marking
events. The system was devised in 1582 by Joseph Scaliger and named after
his father. The first day of this calendar system starts at noon on Jan.
1, 4713 B. C. (Julian)
FYI:
a) Noon on Dec. 31, 1975 starts JD 2,442,778.
b) The Geogian Calendar starts on 15 Oct 1582 with the day prior being 4
Oct 1582 by the Julian Calendar.
c) The last country to switch from the Julian calendar to the Georgian
was Russia in 1918.
d) A year is actually 365dy, 5hr, 48m, 47.00000000095s long. Thus the
reason for leap years.
It was converting an application to Euphoria that calculates the JD from
a given calendar date (or a Georgian calendar date from a JD) that
resulted in my asking about the math functions for floor() and
remainder() in Euphoria. The binary conversion anomaly is giving me fits
when converting to calendar dates for JDN's that = 12/31/xx and JDN's in
leap years after 2/29.
Larry D. Poos
-[USMC (Retar{bks}{bks}ired) Havelock, NC]-
- Programming and System Consultant, LTAD Enterprises -
e-mail: ldpoos at juno.com
Fido: 1:3629/101.6
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