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57 Cards in this Set
- Front
- Back
what direction does earth rotate
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counterclockwise, from west to east
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at what rate does the earth rotate
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15 degrees per hour
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what happens to the rate of rotation as you increase in latitude
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the rate of rotation decreases
..slower at the poles than the equator |
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what is terrestrial evidence for earth's rotation? (2 things)
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a) pendulum appears to change direction
b) coriolis effect-winds or ocean currents are deflected to their right in the north hemisphere and to their left in the south hemisphere |
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what angle is earth tilted at?
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23 1/2 degree angle
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what do the stars appear to do in relation to polaris?
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circle around polaris at the rate of 15 degrees per hour
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where are the direct rays on june 21?
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23 1/2 degees north
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what angle of the sun does NY get on June 21?
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71 degrees
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where does the sun rise on june 21?
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north of east
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where does the sun set on june 21?
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north of west
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how many hours of daulight does NY get on june 21
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15 hours
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how much potential energy does the earth have on june 21
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maximum
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how much kinetic energy does the earth have on june 21?
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minimum
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how much gravity does the earth ahve on june 21?
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minimum
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what does the sun look like on june 21?
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small
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who gets 24 hours of daylight on june 21?
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the north pole
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what do the shadows look like in NY on june 21?
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short
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where on the direct rays of the sun on december 21?
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23 1/2 degrees south
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how many hours of daylight does NY get on december 21?
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9 hours
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what is the angle of teh sun rays in NY on dec. 21?
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26 degrees
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what do the shadows look like in NY on dec. 21?
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long
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who gets 0 hours od daylight on dec. 21?
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north pole
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how much gravity is there on dec. 21
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max
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how much greater is the fravity thanon june 21
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4 times greater
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how much kinetic energy on dec. 21?
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max
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how much potentail energy on dec. 21
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min.
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direct rays on sept./march 21
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equator
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hours of sunlight in NY on sept/march 21
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12 hrs
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angle of sun in NY sept.march 21
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50
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where does the sun rise on december 21
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south of east
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where does sun set on december 21?
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south of west
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what is the altitude of noon on december 21?
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smallest angle (lowest in the sky)
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where does the sun rise on june 21?
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north of east
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where does the sun set on june 21?
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north of west
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what is the alitude of the sun on june 21?
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largest angle (highest in the sky)
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where does the sun rise on march 21 and september 23?
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due east
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where does the sun set on march 21 and september 23?
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due west
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what is the altitude of the noon sun on sep. 21/march21?
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about 45 degrees
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what is evidence for earth's revolution?
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parallax-seen in different constellations at different times of the year
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Months that the sun rises NE and sets NW
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April May June July August
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Months Sun Rises due east and sets due west
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march 21 sept. 21
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when sun rises SE and sets SW
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oct. mov. dec. jan. feb.
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explain where direct rays are
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june 21- 23 1/2 north
july---> august --between 23 1/2 north and 0 sept.-0 Oct. Nov. --> between 0 and 23 1/2 south dec. 21--> 23 1/2 south jan feb. --> between 23 1/2 south and 0 march- 0 april may-->between 0 and 23 1/2 north |
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geocentric model
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said the earth does not rotate or revolve
said planets sun and stars revolved around the earth was unable to explain the pendulum or retrograde motion of the planets |
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heliocentric model
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sun is the center and the planets followed the circular orbits around the sun
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keplers first law
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1st law of orbits-heliocentric but the orbits are eccentric-MODERN MODEL
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Keplers law of equal area
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the earth will sarve out from sun areas that are the same in area in the same amount of days
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parallelism
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tilt of the earth remains constant
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how many minutes later each day does the moon rise?
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50 minutes
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celestial objects
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stars, moon, planets, etc.
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what shape does the sun's apparent path from sunrise to sunset have?
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arc
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only between what two latitudes can the noon sun be directly overhead at an altitude of 90 degrees?
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between 23 1/2 degrees north and 23 1/2 degrees south
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where is the sun directly overhead on june 21?
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23 1/2 degrees north
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where is the sun directly over head on sep. 23 and march 21?
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equator-o degrees
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ere is the sun directly overhead on december 21?
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23 1/2 degrees south
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when is the line of the tilt of the earth perpendicular to?
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its orbit of the sun
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evidence of earths revolution (3)
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1. different constellations for different seasons
2. apparent diamter of the sun 3. doppler effect of stars |