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课件天空望远镜sky amp telescope.pdf

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celestialcalendar

Left:SeeingtheoccultationonJuly17thwillbe

easy—themainissueisknowingwhentolook.

PredictionsforanywhereinNorthAmericacan

bemadebyinterpolatingbetweenthecurves

forVenus’sdisappearance(purple)andreap-

pearance(red)onthisSkyescopemap.The

curvesarelabeledinUniversalTime.Above:

Venusseemstotakevarioustracksbehindthe

Moonaccordingtoanobserver’slocation.This

OccultationofVenusdiagramhascelestialnorthup;thelunarcres-

July17,2001cent’sactualorientationdependsonthetimeof

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