Re: Julian Day Numbers

[Vapuser <vapuser(at)catspaw.jpl.nasa.gov>]

Craig Markwardt <craigmnet@cow.physics.wisc.edu> writes:

 <snip>

> There are other conventions, at least in astronomy.  The Modified
> Julian Day (MJD) and Truncated Julian Day (TJD) are very similar time
> systems, the only difference being the zero-point.  Thankfully these
> systems subtract the 0.5 day that makes standard Julian days so
> complicated and confusing.  [ A day changeover at *noon* ??? ]

  But I thought the Julian Day was created by astronomers to prevent a
  day changeover in the middle of the night, i.e. during one observing
  session! Have I been living a lie all this time!

  I feel *so used*!

whd
-- 
William Daffer: 818-354-0161: William.Daffer@jpl.nasa.gov