Which of the following longitudes is considered as the International date line?

Correct option is D

The correct answer is (D)

Explanation:

• The International Date Line (IDL) is an imaginary line located at approximately 180° longitude (but not a perfectly straight line, as it zigzags to avoid splitting land areas and island groups).
• It serves as the point where the date changes by one day when crossed.

Key Points:

• Purpose of the IDL:
• It is used to differentiate between calendar days.
• Crossing the line from east to west adds a day, while crossing from west to east subtracts a day.
• Why 180° Longitude?
• It is directly opposite the Prime Meridian (0° longitude), making it a logical choice for the division of days.

Why Not Other Options:

• (0°): Refers to the Prime Meridian, which is used as the starting point for measuring longitude.
• (90° W/E): These are intermediate longitudes and do not represent the change of dates.