I would like to calculate with high-accuracy the apparent geocentric positions of this three: Spica, the sun and moon. I will apply the following corrections for Spica:(adsbygoogle = window.adsbygoogle || []).push({});

1. proper motion

2. precession

3. rotation of ecliptic

4. stellar aberration

5. annual parallax

6. gravitational deflection

7. nutation

My questions:

1. Is there any particular order in which these corrections must be done?

2. Do I correct for gravitational deflection for sun and moon too?

3. Do I correct for light-time movement and aberration for moon?

Thank you.

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# Calculating apparent positions of sun and moon

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