29.2 Flashcards
time zone
an area 15 degrees wide in which the time is the same
rotation
the spinning of earth on its axis an imaginary line drawn from earths north pole to its south pole
revolution
the motion of earth in an elliptical orbit around the sun
ecliptic
defined as the plane of earths orbit around the sun
solstice
occurs when earths rotational axis is tilted directly toward the sun or away from the sun
equinox
earths rotational axis is perpendicular to a line drawn from the center of earth to the center of the sun
who devised a method of timekeeping around 3000 B.C.
babylonians
what was the symbol for degree taken from
the sun
how many degrees does the earth spin in one day
360 degrees
how many hours does it take the earth to make one full rotation
24 hours
how many degrees does the earth spin in one hour
15 degrees
what direction does the sun rise
east
what direction does the sun set
west
true or false. all time zones are the exact same size
false, they are modified to fit around cities,states,and country borders, and other key sites
how many time zones are there in the world
24
which direction do you move to add hours to the time
move east
which direction do you move to subtract hours from the time
west
how many time zones are there in the united states
6 time zones
what are the names of the time zones
mountain, daylight ,eastern time, alaska, hawai, pacific,centeral
what is a solar day
full rotation from noon to noon
what is a sidereal day
one full rotation to looking at a specific star one night to the same star the next night
what are the two main reasons for seasons
which 2 seasons have a solstice
which month is the summer solstice
