29.2 Flashcards
Who devised a method of timekeeping around 3000 B.C.?
Babylonians
What was the symbol for degree taken from?
The Babylonian symbol for 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 time zones
Which direction do you move to add hours to the time?
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 time zone Eastern time zone Pacific time zone Alaskan time zone Central time zone Hawaiian time zone
What is a solar day?
The earth’s rotation from the sun in the sky from noon one day to noon the next day.
What is a sidereal day?
When a certain star rises above the horizon until that same star rises again
