chapt 29 Flashcards
(31 cards)
Who devised a method of timekeeping around 3000 B.C?
the Babylonians.
What was the symbol for degree taken from?
The Babylonian symbol 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?
East.
Which direction do you move to subtract hours from the time?
West.
How many time zones are there in the United States?
6.
What are the names of the time zones?
Eastern time, central time, mountain time, pacific time, Atlantic/Alaskan time, and Hawaiian time.
What is a solar day?
When the sun is directly above us at noon and does on full rotation to the next day noon.
What is a sidereal day?
When Earth rotates based of a star.
What are the two main reasons for seasons?
Earths tilt and orbit around the sun.
Which 2 seasons have a solstice?
Summer and winter.
Which month is the summer solstice?
June, 21st.
Which month is the winter solstice?
December, 21st.
Which two seasons are equinoxes?
Spring and Fall.
Which month is the spring equinox?
March 20th or 21st.
Which month is the fall equinox?
September, 22nd-23rd.
When is the longest day of the year?
Summer solstice.
When is the shortest day of the year?
Winter solstice.
