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Lecture 7

GEOG 1280 Lecture 7: Lecture 7

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GEOG 1280
Bruce G.Erickson

Oc78 Unit 3: Tool of the Trade Geography deals with the objects in the world. ** Size and Scale do mater Universe is made of 74 Dark Energy 22 Dark Matter 3.6 Intergalactic Gas 0.4 Stars Earth revolves around the Sun in an elliptical orbit. Smallest distance: Perihelion, 147 million km Jan 25 Largest distance: Aphelion, 152 million km July 37 Facts about the earth Earth rotates on its axis once in 23 hours and 56 minutes with respect to the stars 24hrs with respect to the sun Earths diameter is elliptical, bulges slightly at the equator. Apx 40,000 km Earth tilted at 23.5 degrees The stars appear to rotate around the North Star: Polaris When the sun is directly overhead it is called the subsolar point. Only occurs between the Tropic of Cancer and the Tropic of Capricorn. In winter, the sun is over the Tropic of Capricorn. If you take a picture of the sun at the same time every day of the year it is called an ANALEMMA and forms a figure eight pattern Tides Rotates around a common centre, centre of mass (Barycentre) Water gravitationally pulled towards the moon. Two high tides during a day however. Torque develops on the opposite side of the earth which pushes the water away from the earth. Takes just over 24hrs for a cycle to occur
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