Today: Time in Astronomy Charts and Catalogs Reading: Ch. 2, 3

Astronomy 101

Lecture #2

Today: Time in Astronomy

Charts and Catalogs

Reading: Ch. 2, 3

TCoremeporsrionwt,haisndpettotmy oprarcoewf,roamnddtaoymtoordroawy.,

? William Shakespeare

Wktonhohwaimt wtwhhehanotiaiststkiissm.,eII?fdIoIfwnnoiotshoknntoeowaexs.kpslamine,itI

? Saint Augustine

Astronomy 101

I. The Length of Day

SidesmHErteeqaAarurlisidoTncfioiarmVoxns.eesori=rnnagRltAheof FoSrTan=yRstAa+r:HA

SidebscrureeotcaswclseiDesnesgainvsyteo=wmf otVeirmEidei.an

Lecture #2

Astronomy 101

Solar Time = H+/A 1of2hthe Sun SolatcrwroDossasiynugc=csetosifsmitvehebemeStewurnied.einan

Dsdoailyfafsre. arenndcesibdeetrweaelen

Lecture #2

Astronomy 101

Lecture #2

Solar Time is nonuniform due to: 1) ellipticity of the Earth's orbit 2) treilstpoefctthtoe tEhaeretchl'ispptiocl.ar axis with

MeamneSaonlaSruTnim+e/(M12Sh.T) = HA of hypothetical MeammneeSrainodliSaarunnDc.raoyss=intgims oefbtehtewheyenpottwheotiscuaclcessive

1 solar day = 86,400 solar seconds.

Astronomy 101

Lecture #2

UnGiovrbeesreesnravwlaTitciohmryeMi(nUeaETnn)T=gilmaMnedS(G.TMaAtTlsG)o.rekennowwinchas

Difference between PST and UT is 8 hours in winter and 7 hdoauyrlsigihntssuamvminegrs(tbiemcaeucsheaonfge).

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