Geoscience Reference
In-Depth Information
105° W
60° W
120° W
90° W
75° W
Seattle
Boston
Minneapolis
Detroit
New York
Atlantic
Standard
Time
6:00
San
Francisco
Chicago
Salt
Lake
City
Central
Standard
Time
4:00
Denver
Kansas
City
Cincinnati
Richmond
St. Louis
Los Angeles
Phoenix
Dallas
New Orleans
Miami
120° W
105° W
90° W
75° W
Figure 3.7 Time zones in the contiguous United States and Canada.
The most eastern time zone in the contiguous United
States is Eastern Standard Time, which is 3 h ahead of the most western time zone, Pacific Standard Time.
Perpendicular to
plane of the ecliptic
North
Pole
1
2
°
23
Plane of
the ecliptic
Path of
Earth's orbit
Figure 3.8 The Earth's axial tilt.
The Earth's axis is not perpendicular to the plane of the ecliptic. Instead, the axis is
tilted 23.5° from a line perpendicular to the plane of the ecliptic.
