Chapter 3Cycles of the Sky
Cycles of the Sky Chapter 3:
TheAnnualMotion（周年运动）ofthesunCapricornusSagittariusAquariusScorpiusPisceLibraEarth's orbitAriesJanuaryMarchtVirgoTaurusProiectionofEarth'sLeoGeminiCancerorbit.the ecliptic生DuetoEarth'srevolution（公转）aroundthesun,thesunappearstomovethroughthezodiacalconstellations（黄道星座）Thesun'sapparentpath（视轨道）ontheskyiscalledtheecliptic（黄道）.Equivalent:The eclipticis the projectionof Earth'sorbit ontothecelestialsphere
The Annual Motion（周年运动） of the sun Due to Earth’s revolution（公转） around the sun, the sun appears to move through the zodiacal constellations （黄道星座）. The sun’s apparent path （视轨道）on the sky is called the ecliptic （黄道）. Equivalent: The ecliptic is the projection of Earth’s orbit onto the celestial sphere
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黄道十二宫
The SeasonsCNorthcelestialpoleEarth'sequatorisinclined againstCelestial equatorthe ecliptic by23.5（黄道赤Autumnal equinox道夹角23.5°)WintersolsticeThe differentSummerEclipticincidencesolstice23.5°angle（入射Vernal equinox角）of thesun's rays iscausing theseasonsonSouthcelestialpoleEarth:e 2006 Brocks/Cole-Thomson
The Seasons (I) Earth’ s equator is inclined against the ecliptic by 23.5º.（黄道赤 道夹角 23.5º） The different incidence angle（入射 角） of the sun’s rays is causing the seasons on Earth:
The Seasons(ID)NoonsunNoonsunPSunsetWestWest3CelestialSunsetSouthNorthSouthNorth3DSunriseEastSunriseEastAtsummersolsticeAtwintersolsticeSummersolstice lightWintersolstice light夏至冬至
The Seasons (II) 夏 至 冬 至