The Prime Meridian is the universally decided zero longitude, an imaginary north/south line which bisects the world into two and begins the universal day. The line starts at the north pole, passes across the Royal Observatory in Greenwich, England, and ends at the south pole. Its existence is purely abstract, but it is a globally-unifying line that makes the measurement of time (clocks) and space (maps) consistent across our planet.

The Greenwich line was established in 1884 at the International Meridian Conference, held in Washington DC. That conference's main resolutions were: there was to be a single meridian; it was to cross at Greenwich; there was to be a universal day, and that day would start at mean midnight at the initial meridian. From that moment, the space and time on our globe have been universally coordinated.

Having a single prime meridian brings to the world's cartographers a universal map language allowing them to join their maps together, facilitating international trade and maritime navigation. At the same time, the world now had one matching chronology, a reference by which today you can tell what time of day it is anywhere in the world simply by knowing its longitude.

Mount Susitna (aka Sleeping Lady)
The Hilton Hotel roof provides this view of one of the more famous Anchorage landmarks. Mount Susitna is about 40 air miles west of Anchorage across the Cook Inlet and rises to an elevation of 4,396 feet above sea level. This mountain sits between the Chugach Range to the south of Anchorage and the Alaska Range to the north. We used a 4X telephoto lens to get you up close. Visible in the foreground is the Small Boat Dock and the Cook Inlet.

Mount Susitna is also known to most Anchorage residents as The Sleeping Lady because it looks like a sleeping maiden with her arms folded across her chest.

The UK has announced it is giving up sovereignty of a remote but strategically important cluster of islands in the Indian Ocean after more than half a century.

The deal – reached after years of negotiations - will see the UK hand over the Chagos Islands to Mauritius in a historic move.

This includes the tropical atoll of Diego Garcia, used by the US government as a military base for its navy ships and long-range bomber aircraft.

The announcement, made in a joint statement by the UK and Mauritian Prime Ministers, ends decades of often fractious negotiations between the two countries.

The US-UK base will remain on Diego Garcia – a key factor enabling the deal to go forward at a time of growing geopolitical rivalries in the region between Western countries, India, and China. //

Half a century or more after the UK relinquished control over almost all its vast global empire, it has finally agreed to hand over one of the very last pieces. It has done so reluctantly, perhaps, but also peacefully and legally.

The remaining British overseas territories are: Anguilla, Bermuda, British Antarctic Territory, British Virgin Islands, Cayman Islands, Falkland Islands, Gibraltar, Montserrat, Pitcairn, Saint Helena, Ascension and Tristan da Cunha, South Georgia and the South Sandwich Islands, Turks and Caicos Islands. There are also two sovereign base areas on Cyprus under British jurisdiction.

In a historic move, the United States has officially expanded its geographical territory by one million square kilometers — an area nearly 60 percent the size of Alaska. The catalyst for this territory expansion lies in the redefinition of the U.S. continental shelf boundaries.

By invoking international law, the State Department has outlined new areas under the sea where the continental shelf, a seabed area surrounding large landmasses with relatively shallow waters, extends further than previously recognized.

This monumental addition is spread across seven distinct ocean regions, with over half of the new territory located in the Arctic.