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[Image Credits: Stellarium] … from current LST (Θ~9h 00m) … know γ (α=0 O , δ=0 O ) passes through our N-S meridian ~2am (local) around this time of year … thus can easily determine Altair (α~20h, δ=+8 O ) ie. with an RA ~ 20 hours “after” γ or ~ 4 hours “before” γ culminates at ~10pm (local) Ian M. George PHYS 304 (2011 Fall) Meeting 04
…relationship between systems can be expressed as.. Hour Angle (in degrees etc) cosh = − tanδ tanφ + declination sin a cosδ cosφ altitude of object geogrpahic latitude of observer …you will be given this expression if you need it! …objects “rise” and “set” when a = 0 O of course …hence when cosh = − tanδ tanφ …so given δ and ϕ can calculate h for rise and set …and given α can use Θ = h + α …to calculate the sidereal time of the rise or setting Ian M. George PHYS 304 (2011 Fall) Meeting 04
Page 1 and 2: Meeting #4 PHYS 304 Meeting 04
Page 3: [Image Credits: Stellarium] … rig
Page 7 and 8: … again its usually best to choos
Page 9 and 10: Origin: Sun “Special Direction #1
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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