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Additional Slide [not shown in class] Choice of best Spatial & Temporal Coords to use depends upon application & desired accuracy Know the definitions of the (alt, az) and (α,δ) spherical coord systems Know the definitions of (and differences between) the Mean Sidereal & Mean Solar Days/Years Be able to explain (in a sentence or two) the various effects which lead to corrections having to be made to these coordinate systems for very high-accuracy work. Ian M. George PHYS 304 (2011 Fall) Meeting 04
Additional Slide [not shown in class] Astronomical objects are named in variety of ways: Proper Nouns: eg. the planets, many bright stars (from mythology or historical translations) Constellation appreciations: eg. αCyg, βCyg, γCyg, δCyg, … etc Discoverer(s): eg. Halley’s comet, Comet Hale-Bopp Catalog Entry: eg. NGC 4151, M 31, UGC 454 … etc, etc etc ! Celestial Coords: eg. J00424433+4116074 Date-related Names: eg. GRB 090410, SN 1987a RA & dec in J2000 coords or simply the Year UTC YYMMDD 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 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
Page 41: Additional Slide [not shown in clas

PDF Slides - UMBC

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