Re: Validation
- From: Quadibloc <jsavard@xxxxxxxxx>
- Date: Sat, 6 Sep 2008 18:20:35 -0700 (PDT)
On Sep 6, 3:51 pm, oriel36 <kelleher.ger...@xxxxxxxxx> wrote:
the thing about it is all
gets reset on Feb 29th in a leap year otherwise the procession of the
stars fails.
No.
What happens is this...
A certain star goes to the meridian at a certain time one night.
The next evening, that star comes back 3 minutes and 56 seconds
earlier.
The evening after that, the star comes back 7 minutes and 52 seconds
earlier.
....
And 365 nights after the first night, the star comes back to the
meridian about *one minute later*, because 365 days are about 1/4 of a
day shorter than a true year.
And the next night, the star comes back about 2 minutes and 56 seconds
earlier than on the night we started.
So nothing has to get reset in leap years, it is simply that the error
in 365 days, repeated four times, comes close to the error in one day,
and so they almost cancel. But in about 75 years, that also comes one
day out of synchronization, which is why one leap year is omitted in
three out of four centuries..
John Savard
.
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