Planet X: SLOWING Rotation 1
In Article <9fhitj$3e5$2@bashir.peak.org> Bill Nelson wrote:
> There are many publications from at least 40 years
> ago, that predicted the solar eclipses through the year
> 2100. As far as I know, the predicted times have not
> changed more than a few seconds since then.
Oh? But the Navy recently changed how the Equinox date in computed in
their Almanac. (http://aa.usno.navy.mil/publications/docs/almanacs.html#astalm).
The Formula for computing the Equinox changed, which formula is
dependent upon the "ascending node of the Moon"
(http://aa.usno.navy.mil/publications/docs/update.asa01.html)
Astronomical Almanac 2001
Updates and Corrections.
TIME SCALES AND COORDINATE SYSTEMS,Section B
Page B6, The equation of the equinoxes and the
paragraph following should read:
equation of equinoxes = 1/15(Dy cose + 0."002
64 sin W + 0."000063
sin 2W)
where Dy is the total nutation in longitude,
e is the mean obliquity of the ecliptic and
W is the mean longitude of the ascending node of the
Moon. The equation of the equinoxes is tabulated
on pages B8-B15 at 0hUT for each day and
should be interpolated to the required time if full
precision is required.
Note that Dy and e and W are shown as symbols on the web page.