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| Suns condense from nebular clouds |
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| Mutual attracting force exerted by mass on all other objects |
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| the distance that light travels in one year |
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| solar system located in the orion arm |
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| Center of the galaxy sagittarius A. |
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| solar system-11 light hours |
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| condensed from a large slowly rotating dust and gas called Nebula |
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| two hydrogen atoms combine to form helium |
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Thermonuclear fusion
Hydrogen to helium |
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surface
6000 degrees C
Sunspots |
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| clouds of electrically charged particles |
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caused by magnetic storms
activity cycle of 11 years |
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| incoming solar radiation at the earth surface and atmosphere |
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| region at the top of the atmosphere |
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Sun at 90 degree angle
energy spread over smaller area |
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Oblique angle/Less than 90 degrees
energy spread over larger area |
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1 rotation per 1 solar day
23 hours 56 min
rotates west to east |
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| tilted at an angle of 23.5 degrees from the plane of ecliptic |
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1 revolution every 365.2422 solar days
365 days 5 hours 48 minutes 46 seconds |
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365 days
needs a leap year to account for .261 leftover |
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half the earth always receiving sunlight
divides day from night |
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| Straight line joining two points |
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Imaginary Plane connecting earth and sun
Half above half below |
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| January 3rd (91 million) period when the earth closet to sun |
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| July 4th (95 million miles) when the earth furthest from sun |
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Latitude where the sun is directly overhead at noon
ranges from 23.5 degrees N to 23.5 degrees S |
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Equal night and day.
solar declination is 0 degrees |
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| January 3rd (91 million) period when the earth closet to sun |
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| July 4th (95 million miles) when the earth furthest from sun |
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Latitude where the sun is directly overhead at noon
ranges from 23.5 degrees N to 23.5 degrees S |
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Equal night and day.
solar declination is 0 degrees |
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| march 21 Spring in northern hemishpere |
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| September 21 fall in northern hemisphere |
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| solar declination is farthest from equator |
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december 21 winter in northern hemisphere
northern hemisphere is tilted away from the sun |
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| 24 hours daylight at antarctic circle |
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| June 21st summer in northern hemisphere |
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24 hours of daylight in artic circle
24 hours of night in antarctic circle |
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