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seasons reasons

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Deglin Kenealy

on 28 January 2013

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Transcript of seasons reasons

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli By Deglin, Anya, and Aidan SEASON'S REASONS Tilt of the Earth The sun’s transit and pathway angles change throughout the year and are different for different latitudes. This happens because the earth tilts - on June 21, the northern hemisphere tilts 23° towards the sun, on December 21, the southern hemisphere tilts 23° towards from the sun, and on both equinoxes the Earth doesn't tilt at all. The earth’s rotation is tilted 23 degrees from 90 in relation to its orbit. Light-area = distance squared The further away that the gun is the more it spreads and the more that it spreads the less butter will hit more of the bread. The more butter in one foot that there is the less bread will be able to be buttered. The distance uses twice as many peices of bread. Incidence of Light The further from 90 degrees the incidence of light, the more area the light covers.
When the sun is low over the horizon (in the winter) the angle of incidence is far from 90 so the light spreads over a greater area and it is colder in that given location. On June 21, the sun is at zenith at 23° North latitude because the northern hemisphere tilts 23 degrees towards the sun. On December 21, the sun is at zenith at 23° South latitude because the southern hemisphere tilts 23 degrees towards from the sun. On the equator, the sun is at zenith on both equinoxes because the Earth doesn't tilt in any direction. The relative distance from the Earth to the sun does not change much throughout the year. The Earth is actually closer to the sun during January - December and farther during June - July, this goes against everything we as students had previously thought. The difference between the distance between the sun and the Earth in the winter and the distance between the sun and the Earth in the summer is very small because Earth's orbit is very circular AND NOT OVAL. Light – intensity=1/distance^2
As the intensity of light increases the source must be closer but as it gets less intense the source of the light is farther away. Light spreads so therefore more of the same energy is being spread out into a bigger area but it is less intense. The Earth's distance to the sun DOES NOT affect the seasons. Some proof for this is that the two hemispheres have opposite seasons. 1 AU (astronomical unit) is the average distance from the Earth to the sun. 1 AU = 149, 597, 871 kilometers. When the sun is high in the sky (in the summer) the angle of incidence is close to 90 so the light doesn't spread as much because it covers a smaller area and it is warmer in that given location. The intensity of the sun on the June solstice is higher at 23 degrees latitude than it is anywhere else. It spreads at an even rate. THANK YOU!! THANK YOU!! THANK YOU!! THANK YOU!! THANK YOU!! THANK YOU!! Relative distance to the sun On June 21st, the North Pole will have 24 hours of sunlight because the North Pole will be tilted towards the sun. The South Pole will have 24 hours of darkness because it will be tilted away from the sun. The reverse would be true for the South Pole on December 21. At the equator the day length would be 8 hours on both December and June 21. On December 21st the sun’s transit at the South Pole is 23 degrees above the horizon. This is due to the tilt of the earth on December 21st. On June 21 the sun's transit at the North Pole is 23 degrees above the horizon. The day length is 12 hours on every location on Earth on both equinoxes.
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