CH 29.2 Flashcards
(31 cards)
Is an area 15 degrees wide in which the time is the same.
Time Zone
The spinning of Earth on its axis, an imaginary line drawn from Earth’s North Pole to its South Pole.
Rotation
The motion of Earth in an elliptical orbit around the sun.
Revolution
The plane of Earth’s orbit around the sun.
Ecliptic
Occurs when Earth’s rotational axis is tilted directly toward the sun or away from the sun.
Solstice
Earth’s 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 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 earth spin in one hour?
15 degrees
What direction does the sun rise?
In the east
What direction does the sun set?
In the north
True or False. All time zones are exact same size?
False, they are modified to fit around cities, states, and country borders, and other key sites.
How many 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?
West
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?
When we look at a specific star and make a full rotation back to the star
What are two main reasons for seasons?
THe tilt of the earth and revelation
Which 2 seasons have solstice?
Which month is the summer solstice?
