29.2 Flashcards
(31 cards)
Is an area 15 degrees wide in which the time zone is the same.
Time zones
The spinning of earth on its axis an imaginary line drawn from earths north pole to its south pole.
Rotation
Is the motion of earths annual revolution
Revolution
Is defined as the plane of earths orbit around the sun.
Ecliptic
Occurs when earths rotational axis is tilled directly toward the sun or away from the sun.
Solstice
Earths rotational axis is perpendicular to a line drawn from the center of earth to the center of the sun.
Equinox
Who devised a method of timekeeping around 3000 B.C?
The 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 hours?
15 degrees
What direction does the sun rise?
in the 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?
Which direction do you move to subtract hours from the time?
How many time zones are there in the united states?
What are the names of the time zones?
What is a solar day?
A full rotation from noon to noon
What is a sidereal day?
A full rotation looking at a star one night then looking at it again
What are the two main reasons for seasons?
The tilt of the earth and revolution
Which 2 seasons have a solstice?
Which month is the summer solstice?
