This site from the Encyclopedia Wikipedia provides an encyclopedia article on the prime meridian discusses the important principles were established at the International Meridian Conference in 1884.

In this interactive tutorial students will learn what causes the seasons, diurnal cycles and how the constellations move through the sky. Learn we are able to see other planets and how astronomical events affected life on the Earth.

This site from The Royal Observatory at Greenwich is a very historically important astronomical observatory. The site has a combination of information about astronomy, longitude and time. Information written in highly accessible...

"The quest for a reliable method to find your way at sea was one of the thorniest problems of the 1700s." Find out about the search for longitude at this NOVA site. Includes interactive Shockwave game, learning activities and more.

[Free Registration/Login Required] In this flipchart students will locate major topographical features of the United States of America. Website links covering Identify rivers, mountain ranges, the equator, prime meridian, and lines of...

[Free Registration/Login Required] This flipchart explains the division of the hemispheres, northern and southern, and eastern and western. The Equator and Prime Meridian are defined, as well as latitude and longitude. Students are given...

Examine how the prime meridian came to be, where it is located, and see actual pictures of the prime meridian.

Examine how the prime meridian came to be, where it is located, and see actual pictures of the prime meridian.

Examine how the prime meridian came to be, where it is located, and see actual pictures of the prime meridian.

Developed in 2000-2001 to explore and celebrate the lives of people living in eight countries that lie along the prime meridian, this "welcome to Spain" guidebook and tour includes sections on Spain's history, geography, environment,...

This is a delightful site about boats and boating. Lots of games plus a terrific overview of the history of navigation. Includes a visit to a reproduction of Columbus' Nina.

Wikipedia offers information on the International Date Line, an imaginery line that offsets the hours added as one travels east through time zones.

A plan of the city of Washington from 1790. The lat/long figures on the map shows a longitude of 0 degrees 0 based on the Washington Prime Meridian passing through the Capitol. "This city was laid out by Peter Charles L'Enfant, who...

This website provides a good general definition of the International Date Line.

Map of pre-colonial Africa, showing the predominately native countries and territories of the African continent in 1879. The counties include the Barbary States of Morocco, Algeria, Tunis, Tripoli and Fezzan, the Egyptian territories of...

A map from 1872 of Maine showing the State capital of Augusta, counties and county seats, major cities, towns and ports, railroads, mountains, lakes, rivers, and coastal features. An inset map details the vicinity of Portland. Clock...