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The imaginary line at zero degrees longitude is known as?
A. Equator
B. Prime Meridian
C. International Date Line
D. Tropic of Capricorn
Correct Answer Is Option = Prime Meridian
Notes / Explanation
The imaginary line at zero degrees longitude is known as the Prime Meridian, and it is one of the most important reference lines used for measuring positions and time across the surface of the Earth. While the Equator divides the Earth into northern and southern halves and serves as the starting point for measuring latitude, the Prime Meridian serves as the starting point for measuring longitude, which describes how far east or west a place is located on the globe. The Prime Meridian runs from the North Pole to the South Pole, passing through a number of countries along its path, and it divides the Earth into the Eastern Hemisphere and the Western Hemisphere. All lines of longitude are measured in degrees to the east or to the west of this central line, up to a maximum of one hundred and eighty degrees on either side, where they meet on the opposite side of the Earth. The Prime Meridian is especially important because it forms the basis of the global system of timekeeping. The Earth rotates on its axis, completing one full turn in a day, and as it does so different parts of the world face the Sun at different times. To keep track of time in a consistent way across the whole planet, the world has been divided into time zones, and these time zones are measured in relation to the time at the Prime Meridian. The time at this line is used as a standard reference, and the local time in other regions is calculated by counting the hours ahead of or behind this reference as one moves to the east or to the west. Closely related to the Prime Meridian is another important line on the opposite side of the Earth, where the date changes as one crosses it, allowing the calendar to remain consistent around the globe. The concept of the Prime Meridian is therefore essential for navigation, mapping, and the coordination of time and communication across different parts of the world. For PPSC and other competitive examinations, the key points to remember are that the Prime Meridian lies at zero degrees longitude, that it divides the Earth into the Eastern and Western Hemispheres, that it serves as the starting point for measuring longitude, and that it forms the basis of the global system of standard time.
