Solar Energy and a Spherical Earth Chapter 14.1

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Presentation transcript:

Solar Energy and a Spherical Earth Chapter 14.1 Characteristics of Earth: Spherical Rotating Orbiting These characteristics affect the amount of solar radiation absorbed by different regions.

Basic Ideas The Earth orbits the Sun in one year The Earth spins around once each day The Moon orbits the Earth about once a month

http://www.classzone.com/books/earth_science/terc/content/visualizations/es2503/es2503page01.cfm?chapter_no=visualization http://www.classzone.com/books/earth_science/terc/content/visualizations/es0403/es0403page01.cfm?chapter_no=visualization http://www.classzone.com/books/earth_science/terc/content/visualizations/es0408/es0408page01.cfm?chapter_no=visualization

http://www.classzone.com/books/earth_science/terc/content/visualizations/es2504/es2504page01.cfm?chapter_no=visualization http://www.bbc.co.uk/news/world-12849630 http://www.classzone.com/books/earth_science/terc/content/visualizations/es2505/es2505page01.cfm?chapter_no=visualization

Latitude vs. Longitude Longitude lines: Run North to South Are all the same length Are longer than any line of latitude Measures distance East or West from the PRIME MERIDIAN (00 -1800)

Latitude vs. Longitude Latitude lines: Run from East to West Are parallel to each other Measure distances North and South of the Equator (00 - 900) The Tropics of Cancer and Capricorn (23.5°) and the Arctic and Antarctic Circles are other notable lines of latitude

How did the lines of latitude get special names? http://www.classzone.com/books/earth_science/terc/content/visualizations/es0404/es0404page01.cfm?chapter_no=visualization

How does the spherical shape of Earth influence the climate of different regions? A beam of sunlight that strikes the equator is perpendicular to Earth’s surface Earth’s surface absorbs the maximum amount of energy from the Sun at the equator Energy reaching a region at a higher or lower latitude is spread over a larger area Therefore the Earth’s surface in this region absorbs less energy than at the equator

Why doesn’t the temperature throughout the world stay the same all year? Orbit Earth is rotating on its axis (365 times for every trip) while it rotates around the sun Orientation Earth’s axis is tilted relative to the plane of its orbit

Seasons…

Why does the Earth have Seasons?

Why does the Earth have seasons?

Day vs Night At the equator the length of “day” is approximately the same all year long 12 hours of daylight / 12 hrs of darkness At the north/south poles, the period of daylight changes from winter to summer and back again Winter in the north has darkness for almost 24 hrs Summer in the north has light for almost 24 hrs The opposite season/daylength exists at the south pole For areas in between, the period of daylight changes throughout the year  getting longer as summer is approached/getting shorter as winter is approached This is due to the tilt of the Earth on its axis and the Earth’s position relative to the sun

A scene you will probably never get to see in person A scene you will probably never get to see in person. This is the sunset at the North Pole with the Moon at its closest point. An amazing photo!