Meridian Longitude ((new))

This relationship was the key to solving the "Longitude Problem" of the 18th century. While latitude could be found by the height of the sun or stars, determining longitude required knowing the precise time at a reference point (like Greenwich) while at sea. The invention of the marine chronometer—a clock that could keep accurate time amidst the rolling waves of the ocean—allowed sailors to calculate their east-west position by comparing local noon with the time back home.

In response, the British Parliament passed the , offering a massive cash prize to anyone who could find a reliable way to measure longitude at sea. The Solution: John Harrison’s Chronometer

360∘24 hours=15∘ per hourthe fraction with numerator 360 raised to the composed with power and denominator 24 hours end-fraction equals 15 raised to the composed with power per hour meridian longitude

The Prime Meridian passes through the historic Royal Observatory in Greenwich, London, UK.

In standard geospatial, astronomical, and navigational contexts: This relationship was the key to solving the

The link between longitude and time is so fundamental that it literally divides our days. The world is divided into 24 primary time zones, each roughly 15° of longitude wide, corresponding to one hour of the Earth's rotation. The starting point is , which is effectively the mean solar time at the IERS Reference Meridian.

The United States had already used Greenwich as the basis for its own domestic time zone system. In response, the British Parliament passed the ,

Meridian longitude forms the invisible vertical framework of our global mapping system. It dictates how we measure space, how we standardise time, and how modern technology calculates location. What is a Meridian of Longitude?

Every meridian runs directly north and south.

The Earth is a sphere spanning 360°. Longitude covers 180° East (+180) and 180° West (-180). Minutes ('): Each degree is divided into 60 minutes.

At the Equator, the Earth is widest. Here, one degree of longitude spans roughly . However, as the meridians converge toward the North and South Poles, that distance shrinks to absolute zero.