Earth Science Astronomy 2
Terms
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- what direction does earth rotate
- counterclockwise, from west to east
- at what rate does the earth rotate
- 15 degrees per hour
- what happens to the rate of rotation as you increase in latitude
-
the rate of rotation decreases
..slower at the poles than the equator - what is terrestrial evidence for earth's rotation? (2 things)
-
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 - what angle is earth tilted at?
- 23 1/2 degree angle
- what do the stars appear to do in relation to polaris?
- circle around polaris at the rate of 15 degrees per hour
- where are the direct rays on june 21?
- 23 1/2 degees north
- what angle of the sun does NY get on June 21?
- 71 degrees
- where does the sun rise on june 21?
- north of east
- where does the sun set on june 21?
- north of west
- how many hours of daulight does NY get on june 21
- 15 hours
- how much potential energy does the earth have on june 21
- maximum
- how much kinetic energy does the earth have on june 21?
- minimum
- how much gravity does the earth ahve on june 21?
- minimum
- what does the sun look like on june 21?
- small
- who gets 24 hours of daylight on june 21?
- the north pole
- what do the shadows look like in NY on june 21?
- short
- where on the direct rays of the sun on december 21?
- 23 1/2 degrees south
- how many hours of daylight does NY get on december 21?
- 9 hours
- what is the angle of teh sun rays in NY on dec. 21?
- 26 degrees
- what do the shadows look like in NY on dec. 21?
- long
- who gets 0 hours od daylight on dec. 21?
- north pole
- how much gravity is there on dec. 21
- max
- how much greater is the fravity thanon june 21
- 4 times greater
- how much kinetic energy on dec. 21?
- max
- how much potentail energy on dec. 21
- min.
- direct rays on sept./march 21
- equator
- hours of sunlight in NY on sept/march 21
- 12 hrs
- angle of sun in NY sept.march 21
- 50
- where does the sun rise on december 21
- south of east
- where does sun set on december 21?
- south of west
- what is the altitude of noon on december 21?
- smallest angle (lowest in the sky)
- what is the alitude of the sun on june 21?
- largest angle (highest in the sky)
- where does the sun rise on march 21 and september 23?
- due east
- where does the sun set on march 21 and september 23?
- due west
- what is the altitude of the noon sun on sep. 21/march21?
- about 45 degrees
- what is evidence for earth's revolution?
- parallax-seen in different constellations at different times of the year
- Months that the sun rises NE and sets NW
- April May June July August
- Months Sun Rises due east and sets due west
- march 21 sept. 21
- when sun rises SE and sets SW
- oct. mov. dec. jan. feb.
- explain where direct rays are
-
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 - geocentric model
-
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 - heliocentric model
- sun is the center and the planets followed the circular orbits around the sun
- keplers first law
- 1st law of orbits-heliocentric but the orbits are eccentric-MODERN MODEL
- Keplers law of equal area
- the earth will sarve out from sun areas that are the same in area in the same amount of days
- parallelism
- tilt of the earth remains constant
- how many minutes later each day does the moon rise?
- 50 minutes
- celestial objects
- stars, moon, planets, etc.
- what shape does the sun's apparent path from sunrise to sunset have?
- arc
- only between what two latitudes can the noon sun be directly overhead at an altitude of 90 degrees?
- between 23 1/2 degrees north and 23 1/2 degrees south
- where is the sun directly overhead on june 21?
- 23 1/2 degrees north
- where is the sun directly over head on sep. 23 and march 21?
- equator-o degrees
- ere is the sun directly overhead on december 21?
- 23 1/2 degrees south
- when is the line of the tilt of the earth perpendicular to?
- its orbit of the sun
- evidence of earths revolution (3)
-
1. different constellations for different seasons
2. apparent diamter of the sun
3. doppler effect of stars