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in The Earth: Form, Motions, Location and Calculations of Time by (58.5k points)
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Explain the position of the international date line.

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International date line: Seeing carefully, it will be known that this line is not straight. What is the reason for this? This line does not lie 180° longitude line from its one end to the other end. In many places, there it strays. Because 180° longitude goes through the many islands of the Pacific Ocean which are governed by the same state.

Therefore, if the international date line was also passed above 180° longitude, then somewhere there would be two dates in the same day in one country, which would have resulted in big inconvenience. Therefore, this line has been made along the 180° longitude but with a zigzag as per requirement.

On seeing the picture of the date line it is clear that its first turn is towards the east. In the Bering Straits between Siberia and Alaska it turns from the 180° East longitude and turns to east. To some distance south to this, to avoid the Aleutian islands, this line moves towards the west. Thus, difference of dates exists between Siberia and Alaska.

Suppose if in Siberia it is July 15th, then in Alaska it would only be 14th of July. The 180° long line passes through the middle of an island of Fiji Islands group. Therefore, due to the difference in timing between the two parts of the same island by date line can be quite inconvenient. Thus, in the southern hemisphere, this line makes a detour around Fiji and Toga islands. The date is kept similar to New Zealand in these.

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