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… so say you have.. Target position in Coord System #1 (eg (α,δ) in Eq.Sys @ defined time) and Your Position (eg long, lat & local time on Earth) Coordinate Transformations Any Necessary Corrections Target position in Coord System #2 (eg (alt,az) in Horiz.Sys ) at desired time Ian M. George PHYS 304 (2011 Fall) Meeting 04
… which corrections are really necessary depends upon the accuracy one requires (often all the corrections certainly are not always required since other effects can dominate the accuracy that can be achieved) 1) Shape of the Earth [text Sect.2.2] Earth is not a perfect sphere radius towards equator ~ 21.4 km larger than that to poles thus corrections to account for observer’s pos n req d 2) Parallax & Aberration due to Orbit & Spin of the Earth [text Sect.2.9,10] Nearby objects will appear to move against more distant objects due to annual & diurnal parallax Special relativity: aberration due to Earth’s motion (
Page 1 and 2: Meeting #4 PHYS 304 Meeting 04
Page 3 and 4: [Image Credits: Stellarium] … rig
Page 5 and 6: …relationship between systems can
Page 7 and 8: … again its usually best to choos
Page 9: Origin: Sun “Special Direction #1
Page 13 and 14: Tilt angle stays (approx) constant
Page 15 and 16: For the last few years… The preci
Page 17 and 18: … for ground-based observations
Page 19 and 20: A final problem for ground-based ob
Page 21 and 22: … even spin axis wobbles (v.sligh
Page 23 and 24: there are 24 hours in a “Day”,
Page 25 and 26: Additional Slide [not shown in clas
Page 27 and 28: Solar Day is longer than Sidereal D
Page 29 and 30: ut Solar Time is actually a bit tri

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