懂视

日全食来时,各地看到日全食的顺序是自西向东开始的,还是自东向西的?

2024-12-12 06:11:56

1.Duringasolareclipse,thesequenceinwhichdifferentlocationsexperiencethetotaleclipseisindeedfromeasttowest.2.ThisisbecauseastheMoonorbitstheEarth,theshadowitcastsontheEarth'ssurfacemovesinthisdirection.3.Atthebeginningoftheeclipse,theMoonispositionedbetweentheSunandtheEarth,withitsshadowfallingfirstonthewesternregionsoftheplanet.4.Intheseareas,theSunandtheMoonappeartobeinastraightline,markingthestartofthetotaleclipseforthoseobservers.5.Astimepasses,theMoonmoveseastward,andtheSunfollows,causingtheshadowtoshiftinthesamedirection.6.Initially,theshadowmovesrelativelyquicklyduetotheobliqueangleatwhichtheMoon'sshadowstrikestheEarth.7.AstherelativepositionsoftheMoonandtheSunchange,theshadowbecomesmorevertical,slowingdownthepaceofitsmovement.8.Finally,astheshadowtiltsagain,thespeedpicksuponcemore.9.ThenotionthattheMoon'sshadowmovesfasterthantheEarth'srotationisacommonmisconception.Thecorrectexplanationshouldbebasedontheconceptoftheangularvelocity.10.ThespeedatwhichtheMoon'sshadowmovesacrosstheEarth'ssurfaceisdeterminedbythedifferencebetweentheMoon'sorbitalspeedaroundtheEarthandtheEarth'srotationalspeed,notasimplecomparisonofabsolutespeeds.