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days-after-J2000.0

To: rrrs-authors@mc.lcs.mit.edu
Subject: days-after-J2000.0
From: John D. Ramsdell <ramsdell%linus@mitre-bedford.ARPA>
Date: Fri, 17 Jun 88 08:21:53 EDT
Church: Our Lady of Balanced Parentheses
In-Reply-To: Hal Abelson's message of Wed, 15 Jun 88 12:11:42 edt <8806151611.AA03404@murren>
Posted-Date: Fri, 17 Jun 88 08:21:53 EDT
Posted-From: The MITRE Corp., Bedford, MA

Another try....


(days-after-J2000.0)					procedure
days-after-J2000.0 returns a real number giving the current universal
time (UT1) minus the universal time at Noon of January 1, 2000 GMT.
Small time differences are accurate to within a second.  The unit of
universal time is a mean solar day.  The universal time UT1 is the
siderial time corrected to mean solar time and corrected for polar
movement.  J2000.0 is the Julian epoch of the time origin.

Follow-Ups:
- Re: days-after-J2000.0
  - From: willc@tekchips.crl

References:
- seconds-after-J2000.0
  - From: hal@MURREN.AI.MIT.EDU (Hal Abelson)

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