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Science Forum Index » Astro Forum » Looking for verification of some results...
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Message |
| MET... |
 Posted: Mon Jun 23, 2008 7:18 am |
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Guest
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I have written a program for calculating the positions of sun, moon
and planets in various coordinate-systems. Depending on the selected
option for the type of coordinate, 'geometric', 'astrometric' or
'apparent', the positions in a heliocentric, geocentric and
topocentric frame are calculated. As far as the results could be
verified with those of CalSky, the program works (now) fine. However,
with the chosen systematics some coordinates are calculated which I
couldn't verify since CalSky doesn't show these results. May be there
is a member here in the forum having the possibility and being so kind
to verify one or the other of the calculated coordinates for the test
example shown below. Thank you.
Marcel
Test example:
===========
Observer:
--------
Lon:+67.13(N) Lat:+24.90(E) Alt: 22m a.s.l.
LT = 21h 30m 00s UT1(GMT) = 16h 30m 00s
Results:
-------
Note: The expected accuracy is approx. 1" arc for sun, moon and earth
and approx. 5" arc for the other planets.
(1) TOPOCENTRIC (air free), equatorial, GEOMETRIC, true equinox,
ecliptic of date:
---------------------------------------------------------------------------------
Sun:
RA : 5.78758 h
Dec: 23.40687 °
Moon:
RA : 9.00139 h
Dec: 18.82237 °
Venus:
RA : 9.00425 h
Dec: 18.91495 °
(2) GEOCENTRIC, ecliptical, ASTROMETRIC (J2000):
-----------------------------------------------
Sun:
Lon: 86.96635 °
Lat: 0.00014 °
Moon:
Lon: 132.67696 °
Lat: 2.29589 °
Venus:
Lon: 131.96516 °
Lat: 1.81413 °
(3a) HELIOCENTRIC, ecliptical, ASTROMETRIC (J2000):
--------------------------------------------------
Venus:
Lon: 228.91046 °
Lat: 1.60926 °
Earth:
Lon: 266.98059 °
Lat: 0.00200 °
(3b) HELIOCENTRIC, ecliptical, APPARENT:
---------------------------------------
Venus:
Lon: 229.00518 °
Lat: 1.58198 °
Earth:
Lon: 267.07618 °
Lat: -0.00015 ° |
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