Seasonal Changes in Radiation
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| Rotation | The time it takes for Earth to spin once on its axis; a day; 24 hours
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| Revolution | The time it takes for a planet to complete an orbit around the sun; 1 year
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| Tropic of Cancer | 23.5 North latitude
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| Tropic of Capricorn | 23.5 South latitude
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| Equator | 0 degrees latitude; the sun's perpendicular rays hit here on equinoxes.
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| Tropics | The area of Earth between the Tropic of Cancer and Capricorn; Warm temperatures all year; no seasons.
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| Temperate Zone | "Mid-latitudes"; The area of Earth between 23.5 - 66.5 North and South; Experiences 4 seasons
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| Polar Zone | The area between 66.5 - 90 North and South latitude
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| What is Earth's axial tilt? | 23.5 degrees
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| Summer Solstice | 1st day of summer; June 21; Sun is directly above 23.5 N.
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| Winter Solstice | 1st day of winter; December 21; Sun is directly above 23.5 S.
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| Vernal Equinox | 1st day of spring; March 21; Sun is directly above the equator.
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| Autumnal Equinox | 1st day of autumn or fall; September 23; Sun is directly above the equator.
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| What is the longest day of the year? | Summer solstice, June 21st
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| What is the shortest day of the year? | Winter solstice, December 21st
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| During the seasons of __________ and ____________, the sun's perpendicular rays are in the northern hemisphere. | Spring and Summer
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| During the seasons of _________ and _________, the sun's perpendicular rays are in the southern hemisphere. | Autumn and Winter
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| When it is summer in the northern hemisphere, it is _______________ in the southern hemisphere. | Winter
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| If Earth was not tilted, this location would receive maximum solar radiation all year: _________________. | the equator
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