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Transcript
The Reason for the Seasons ___________ Earth _______ on ________ (imaginary line through center of Earth from North to South Pole) Rotation is ___________ clockwise as seen from North Pole Earth spins on its axis like a top Polaris __________ - Axis Earth tilt =_________ Axis currently pointed at Polaris (the North Star) ___________ Earth rotates once every _______ hrs The rotation causes _______ & _________ Earth’s rotation causes celestial objects to appear to move from east to west in Northern Hemisphere Night and Day Map Just Checking… What does it mean when we say the Earth rotates? ___________________ _______________________________ How would you define or explain the concept of Earth’s axis? ____________ ________________________________ ________________________________ _______________ Movement of one object around another Earth _____________ around Sun ______________________________ Earth’s orbit is almost circular rather than oval shaped but is still referred to as an _________________________ orbit ________days to revolve once around the Sun (~ a year) The imaginary line that runs through the north and south poles of the Earth is called the __________________ Decide weather each example is of A. Rotation or B. Revolution The Earth spinning on it’s axis. ________________ A baseball player running around the infield. ____________ Takes 1 year ________________ A top spinning ________________ Causes day and night. ________________ Takes 24 hours ________________ The moon circling the Earth ________________ Location and Distance in Orbit Two Primary Reasons for the Seasons (on Earth) 1. The ____________ of the earth 2. The __________ of Sunlight hitting the earth Handout available at http://www.uwm.edu/~kahl/CoVis/Seasons/ Seasons Seasons Northern hemisphere tilts _________ Sun = warmer (Summer) Seasons Northern hemisphere tilts _________ from Sun = cooler (winter) Seasons In the Spring and the Fall, the tilt of the Earth is such that the spread of sunlight shines on the Earth approximately ______ Seasons Southern hemisphere seasons are opposite Northern hemisphere seasons If its Winter here, then Australia is having ____________. Solstices Occur twice yearly when the Sun is directly over “Tropics” (23.5°N and 23.5°S Latitude) winter solstice = shortest day of the year for Northern Hemisphere (Sun directly over Tropic of Capricorn-23.5°S-at noon) Summer Solstice is the longest day of the year in the Northern Hemisphere (Sun directly over Tropic of Cancer-23.5°N-at noon Equinox equal night & day Occurs twice each year Half-way between solstices noon sun directly over equator Sun will be at its highest point in our sky at noon but never directly overhead in Texas… why do you think this is true? Your answer should refer to Godley, TX. This occurs because the Earth’s axis is tilted as it moves around the sun. ______________ This occurs when the Northern hemisphere is tilted towards the sun. ________________ This is when the length of day and night are equal. __________ The shortest and longest days of the year when the noon sun is directly overhead at 23.5 degrees. ___________ This occurs when the Northern hemisphere is tilted away from the sun. ___________ A. B. C. D. E. Winter Summer Solstice Equinox All of the above