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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: Thu, 16 Jun 88 13:33:14 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: Thu, 16 Jun 88 13:33:14 EDT
Posted-From: The MITRE Corp., Bedford, MA

Let us limit the accuracy to about one seconds worth of time.

(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
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.

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

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