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Precession of the equinoxes the location of the

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Precession of the equinoxes> the location of the rising sun has changed slightlyThe alignment of the Heel Stone with the rising sun on the Summer Solstice is clear evidencethat ancient peoples, as far back as ~3200 BCE had an understanding of the movement of theSunLesson 1 Part 5 The Sun’s Daily CycleThe Sun rises in the east and sets in the westThe Earth spins around its North-South axisThe Earth spins from West towards the EastDiurnal motion: the daily motion of the Sun, the stars, and other celestial bodies across the skyThe path the Sun takes is different depending on where you are on the planetNoon (Day)In the Northern Hemisphere, people perceive the sun at its highest point in the Southern directionIn the Southern Hemisphere, people perceive the sun at its lowest point in the Northern directionSunsetIn the Northern Hemisphere, the sun is at its lowest point and near the horizon. It sets at theNorthwest directionIn the Southern Hemisphere, the sun is at its highest point and near the horizon. It sets in theSouthwest directionMidnightIn the Northern Hemisphere, people face towards the midnight sun and the sun does not setbelow the horizon. It is in the Northern directionIn the Southern Hemisphere, people face away from the midnight sun and the sun does not setbelow the horizon. It is in the Southern directionSunriseIn the Northern Hemisphere, the sun is low at the horizon. The sun rises in the Northeast in thesummer and rises in the Southeast in the winterIn the Southern Hemisphere, the sun is also low at the horizon. The sun rises in the Northeast inthe winter and rises in the Southeast in the summerLesson 1 Part 6 The Sun’s Annual CycleThe daytime and nighttime length is about 12 hours each on the equinoxes.Lesson 1 Part 7 The Cause of the SeasonsThe spinning of the Earth around its North-South axis creates Diurnal motion on the skyIndirect light where Sun is lowest in the skyNorth pole tilted away from the Sun = winter in Northern HemisphereDirect light where Sun is highest in the skyNorth pole tilted towards the Sun = summer in Northern Hemisphere
The Northern Hemisphere gets more direct light when the North Pole is tilted towards the SunLesson 1 Part 8 The Sun and LatitudeLatitudemeasured in 'Degrees North' or 'Degrees South' of the Equatorthe Equator is defined as 0ºthe North Pole is defined as 90ºNthe South Pole is defined as 90ºSLongitudemeasured in 'Degrees East' or 'Degrees West' of the Prime Meridianthe Prime Meridian is defined as 0º East West Rio de Janiero 43ºWthe location of the Prime Meridian goes through the Royal Observatory, Greenwich, UKNorth Pole - 90 degrees NArctic Circle 90 - 23.5 = 66.5 degrees NTropic of Cancer 23.5 degrees NEquator 0 degreesTropic of Capricorn 23.5 degrees SAntarctic Circle 90 - 23.5 = 66.5 degrees SSouth Pole 90 degrees SLesson 1 Part 9 The Celestial SphereThe Celestial Sphere is an imaginary (though useful) sphere of arbitrarily large size All objectsin the sky (sun, moon, stars, planets) can be imagined as if they are projected against the insideof this imaginary sphereCoordinates: Altitude and AzimuthAltitude (Alt.): Height above the horizonAzimuth (Az.): Compass directionLesson 1 Part 10 Describing Lengths on the SkyIf the Moon is 0.5º, that means it is smaller than one finger held at arms lengthHolding your hand at arms length

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Term
Fall
Professor
RobinMetcalfe
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