In world timekeeping, the Prime Meridian (zero degree longitude) passes through which of the following places?

Introduction / Context:
The Prime Meridian is the reference line for longitude measurements on Earth. It is defined as zero degree longitude and is used to set Greenwich Mean Time, which historically served as the basis for world timekeeping. This question checks whether you know which place the Prime Meridian officially passes through.

Given Data / Assumptions:

• The term Prime Meridian refers to the internationally agreed zero degree longitude line.
• The options include Paris, Greenwich, New York, Delhi and Rome.
• We assume the modern standard adopted by international agreement in the late nineteenth century.
• The main concept is linking the Prime Meridian with its observatory location.

Concept / Approach:
The Prime Meridian passes through the Royal Observatory at Greenwich in London. This line was chosen by international agreement to serve as the reference for longitude and time. As a result, Greenwich Mean Time became the reference time zone from which others are measured. While there were historical meridians in Paris and other locations, Greenwich is the recognised global standard.

Step-by-Step Solution:
Step 1: Recall that longitude lines are measured east and west from a zero reference line called the Prime Meridian.Step 2: Remember that international conferences agreed to use the Greenwich Meridian, passing through the Royal Observatory near London, as this zero reference.Step 3: Consider the options. Paris has its own historic meridian but it was not chosen as the standard for global longitude.Step 4: New York, Delhi and Rome are important cities but do not host the official Prime Meridian.Step 5: Therefore, the correct answer is Greenwich.

Verification / Alternative check:
World maps and atlases show longitude lines labelled from zero at Greenwich. Time zone descriptions also use Greenwich Mean Time as a central reference. Visitors to the Royal Observatory at Greenwich can see the marked line of the Prime Meridian on the ground. These multiple sources confirm the connection between the Prime Meridian and Greenwich.

Why Other Options Are Wrong:
Paris historically used a different meridian for French mapping, but it did not become the international standard. New York, Delhi and Rome are located at different longitudes and play no special role in defining zero degree longitude. While these cities may serve as local references, they are not linked to the global Prime Meridian.

Common Pitfalls:
Some learners confuse Prime Meridian with the International Date Line or think of any famous European capital. Others may have heard of the Paris meridian and mistakenly believe it is the global reference. To avoid confusion, remember the phrase Greenwich Meridian for zero longitude and International Date Line for the boundary where calendar dates change, usually near 180 degrees longitude.

Final Answer:
The Prime Meridian at zero degree longitude passes through Greenwich.