Re: Calculating Moon Azimuth


Brian Tung wrote:
B M wrote:
According to the source code, I think it is the ecliptic lat and
ecliptic long? Would that be the same as Lat and Long?

No. Latitude and longitude on the Earth is reckoned from the Earth's
axis and the zero longitude line through Greenwich; ecliptic latitude
and longitude are reckoned from the ecliptic axis (perpendicular to the
Earth's orbit) and the zero point of Aries. The two axes are separated
by the 23.4 degree angle of the Earth's tilt, and what's more, the
Earth's latitude/longitude system is constant rotating with respect to
the ecliptic longitude/latitude system, at one revolution per sidereal
day.


To add further to your freakish description,the sidereal consequence
is that the Earth maintains a constant face to the Sun when it simply
does not -

http://www.pfm.howard.edu/astronomy/Chaisson/AT401/IMAGES/AACHCIR0.JPG

In an era where it is vital to get accurate working principles for
axial/orbital motions and orientations for climatology ,this is how you
look on things !.

The Earth orbital orientation,assigned through the division betwen
direct Sunlight and the orbital shadow changes over the course of an
annual orbit causing the shadow to move across either poles at specific
points in the Earths' orbit.

The extreme fixed tilt of Uranus demonstrates that orbital orientation
changes and it is no different for the Earth

http://physics.uoregon.edu/~jimbrau/BrauImNew/Chap13/FG13_06.jpg

Your celestial sphere and the sidereal justification of it is creating
havoc where an accurate version of the Earths' motions and orientations
are required.The horrendous thing is that I remain the sole voice
presently in the midst of this intellectual and intuitive holocaust and
it is time for others to actively recover the lost working astronomical
blueprints of Copernicus and Kepler.






Whew. After all that, what you need to do is to convert ecliptic
latitude and longitude into equatorial coordinates. I think Paul
Schlyter's page has some tips on how to do that.

--
Brian Tung <brian@xxxxxxx>
The Astronomy Corner at http://astro.isi.edu/
Unofficial C5+ Home Page at http://astro.isi.edu/c5plus/
The PleiadAtlas Home Page at http://astro.isi.edu/pleiadatlas/
My Own Personal FAQ (SAA) at http://astro.isi.edu/reference/faq.html

.

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