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Fundamentals of Physical Geography

2nd Edition
James Petersen
ISBN: 9781133606536

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BuyFindarrow_forward

Fundamentals of Physical Geography

2nd Edition
James Petersen
ISBN: 9781133606536
Textbook Problem

Why were the time zones established, and why are they generally centered on even 15° meridians of longitude?

To determine

The reason for the establishment of time zones and the reason for the time zones being centered on even 15° meridians of longitude.

Explanation

Till the 19th century, the time is measured by means of solar noon and follows local time in a town or area. When the vertical stake shows its shortest shadow, it is determined as solar mean. This implies that the sun has reached its highest angle for that day and the time is set accordingly. However, due to the Earth’s rotation, the solar noon occurs earlier in the east side towns and late in the west side towns. Hence, to avoid this, the time zones are established. Time zones calculate the time based on the relationship between the Earth’s rotation, longitude, and time.

According to the international agreement, 24 time zones are there in a day and each with a span of 15° longitude

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