Chapter 29.2 Flashcards
Who devised a method of timekeeping around 3000 B.C.
Babylonians
What was the symbol for degree taken from?
from the sun
How many hours does it take 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 hours does the earth spin in one hour?
15 hours
What direction does the sun rise?
East
What direction does the sun set?
West
True or false. All the time zones are the exact same size?
False
False, they are modified to fit around cities, state, 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?
4
What are the names of the time zones?
Atlantic/Alaskan time zone Pacific time zone Mountain time zone Central time zone Eastern time zone
What is a solar day?
see the sun at noon 1 day, to noon the next day
What is a sidereal day?
see on star one night, then the same star the next night
What are 2 main reasons for seasons?
the tilt of the axis and the revolution
Which 2 seasons have a solstice?
Which month is the summer solstice?
June 21st
Which month is the winter solstice?
December 21st
Which 2 seasons are equinoxs?
winter and summer
Which month is the spring equinox?
March 21st or 22nd
Which month is the fall equinox?
September 22nd or the 23rd
When is the longest day of the year?
summer solstic, June 21st
