Summer solstice autumnal equinox winter solstice how

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Summer solsticeAutumnal equinoxWinter SolsticeHow are the celestialHow are the celestialequator and eclipticequator and eclipticdifferent?different?Equinoxes and solsticesEquinoxes and solsticesare significant pointsare significant pointsalong Earth’s orbit thatalong Earth’s orbit thatare determined by theare determined by therelationship between therelationship between theSun’s path on the celestialSun’s path on the celestialsphere (thesphere (the eclipticecliptic) and) andthethe celestial equatorcelestial equator..Chapter 1:INTRODUCTIONChapter 1:INTRODUCTIONEarth’s Motion - RevolutionEarth’s Motion - Revolution
Summer solsticeAutumnal equinoxWinter SolsticeWhatWhatareareequinoxes?equinoxes?Spring EquinoxSpring Equinox::FirstFirstday of Spring when sunday of Spring when suncrosses the celestialcrosses the celestialequator first time in theequator first time in theyear.Also known asyear.Also known asVernal EquinoxVernal EquinoxAutumnal EquinoxAutumnal Equinox::FirstFirstday of Fall when sunday of Fall when suncrosses the celestialcrosses the celestialequator six monthsequator six monthslaterlater.Chapter 1:INTRODUCTIONChapter 1:INTRODUCTIONEarth’s Motion - RevolutionEarth’s Motion - Revolution
Summer solsticeAutumnal equinoxWinter SolsticeWhat are the solstices?What are the solstices?Summer solsticeSummer solstice:First day of summer.Longest dayFirst day of summer.Longest dayof the year.Sun is at its highestof the year.Sun is at its highestpoint in the ecliptic.point in the ecliptic.Winter SolsticeWinter Solstice::First dayFirst dayof winter.Shortest dayof winter.Shortest dayof year.Sun is at itsof year.Sun is at itslowest point in thelowest point in theecliptic.ecliptic..Chapter 1:INTRODUCTIONChapter 1:INTRODUCTIONEarth’s Motion - RevolutionEarth’s Motion - Revolution
ECLIPTIC:the apparentpath of the Sun in the skyPLANETS:five ancientplanets.Mercury, Venus,Mars, Jupiter, SaturnZODIAC:path of planetswithin a zone of 18 degreeswide centered on theecliptic.Chapter 1:INTRODUCTIONChapter 1:INTRODUCTIONEarth’s Motion - RevolutionEarth’s Motion - RevolutionHow did our ancestors look at the sky and observe some key points?
ZODIAC:path of planetswithin a zone of 18degrees wide centeredon the ecliptic.ZENITH: the point in thesky directly above theobserverChapter 1:INTRODUCTIONChapter 1:INTRODUCTIONEarth’s Motion - RevolutionEarth’s Motion - RevolutionHow did our ancestors look at the sky and observe some key points?
Why did the North Star change over time?The position of the NorthCelestial Pole slowly changesover time.Today, the North CelestialPole is near the star Polaris,which we call the “North Star.”In 3000 BC, the star Thubanwas close to the NorthCelestial Pole.

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Term
Fall
Professor
HAERI
Tags
Astronomy, Moons, Ecliptic Plane, North Celestial, Moon Motion

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