Page 46 - Geography for Secondary Schools Student’s Book Form One
P. 46
Geography for Secondary Schools
Student’s Book Form One
The International Date Line
The International Date Line (IDL) is an imaginary line where date is changed or calendar
day begins. This line is internationally agreed upon, and follows the meridian of 180° W
(or E) longitude except where it crosses land surface (Figure 3.17). However, the IDL
is not straight for the purpose of avoiding crossing land masses which would cause a
country to have two different days at the same time.
FOR ONLINE READING ONLY
150 0 165 0 180 0 165 0 150 0
Siberia Alaska
75 0
60 0
OCTOBER 25 OCTOBER 26
45 0
International Date line 30 0 0
15
GAIN A DAY 0 0
15 0
30 0
LOSE A DAY
Figure 3.17: The International Date Line
Activity 3.10
Design a pictorial chart giving information of the important parallels and meridians
of the Earth.
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