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: 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.