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Origin: Sun “Special Direction #1” – Ecliptic Plane “Special Direction #2” – ϒ Spatial coordinates: Ecliptic Latitude (β) angle “up” from the ecliptic plane Ecliptic Longitude (λ) angle around the ecliptic plane from ϒ (counterclockwise) … useful for objects in the Solar system Ian M. George PHYS 304 (2011 Fall) Meeting 04
Origin: Sun “Special Direction #1” – Galactic Plane “Special Direction #2” – direction of the Galactic Center Spatial coordinates: Galactic Latitude (b) angle “up” from the galactic plane Galactic Longitude (l) angle around the galactic plane from G.C (counterclockwise) … useful for objects in (duh!) the Galaxy Ian M. George PHYS 304 (2011 Fall) Meeting 04
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: … again its usually best to choos
Page 11 and 12: … which corrections are really ne
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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