Time Zones Worksheet Template With Answers Page 2
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2Time Zones Spring Solution.doc
1/27/2016
Clock and Solar Noon
The clock time is the local clock time. Due to the finite width of the time zones, it does not always fit
the solar meaning of time.
SOLAR NOON = SUN ON OBSERVER'S MERIDIAN (TRANSIT)
On the time zone center longitude, clock noon corresponds (roughly) to solar noon. For each degree of longi-
tude of difference between your location and the center meridian, there will be four minutes of difference
between your solar noon and civil noon.
EAST OF TZ CENTER: SOLAR NOON before civil noon.
WEST OF TZ CENTER: SOLAR NOON after civil noon.
Sun at clock noon:
solar noon for TZ center
Solar
Solar
noon for
noon for
eastern
western
Time
observer
observer
Zone
Eastern
Western
Observer
Observer
Thus solar noon occurs early in the eastern part of the time zone and late in the western part of the time
zone. Complete the following table by calculating the difference between the city’s longitude and that of the
time zone center and using 1 hour = 15° and 1 min = 15’.
Longitude
Solar Noon
Difference
Early or
City
Time Zone
Clock Time
City
Deg. &
E or W
Center
Late
min.
10’
W
Late
12:00:40 pm
Canton, NY
75°10’ W
75° W
4° 45’
E
Early
11:41 am
Portland, ME
70°15’ W
75° W
14° 15’
W
Late
12:57 pm
Thunder Bay, Ontario
89°15’ W
75° W
Lhasa, Tibet
29°
W
Late
1:56 pm
91° E
120° E
(CCT: UTC + 8)
west to east
Longitude is measured
in the eastern hemisphere!
Use a globe!
Page 2
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