Chapter 29.2 Flashcards
an area 15 degrees wide in which the time is the same
time zone
the spinning of Earth on its axis
rotation
the motion of Earth in an elliptical orbit around the sun
revolution
the plane of Earths 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
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 fir 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 to your 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
What are the two main reasons for seasons
The axis tilt and how close earth is to the sun
Which two seasons have a solstice
Summer and Winter
Which month is the summer solstice
June
