The position of any point on the earth's surface is given uniquely by the intersection of the circles of latitude and longitude.īy convention, the latitude is given first when giving the position of any point.
The prime meridian is also used as the basis for the world’s time zones. Global positioning satellite systems and radar have added to the tools available to the modern navigator. The prime meridian is the imaginary line that divides Earth into two equal parts: the Eastern Hemisphere and the Western Hemisphere. The advent of radio in the early twentieth century enabled navigators to verify the accuracy of their chronometers with time signals broadcast from known locations. It took until the 1850's to build accurate chronometers cheap enough for their widespread use. The second, and simpler, method involved taking a chronometer, which could keep very accurate time at sea, and calculate position almost immediately by comparing the chronometer time for the fixed reference point with local time. The prime meridian passes through greenwich, England. the equator and prime meridian meet just below africa on water. This method required the compilation of tables of reference values (an almanac) for every day of every year well in advance of their required use - a task which required a lot of human calculating time in a pre-electronic computer era. the prime meridian goes over land and water. One involved measuring the lunar distance - the angle between the Moon and another celestial object (a star or the sun) - which would lead to determination of the position of the measurer through calculation based on reference values. If a navigator knew the time at a particular fixed reference point when the local time could be determined at the ship's location, the difference between the reference time and the apparent local time would give the ship's position relative to the fixed location. These values vary from $$ per hour, so there is a direct relationship between time and longitude. Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Content Latitude and Longitude Latitude Latitude is a measure of the position of a point on the earth's surface in terms of degrees north or south of a baseline - the equator. The main difference between prime meridian and equator is that the equator is the line circling halfway between the North and the South Pole while the prime meridian is the line that runs via Greenwich.Britannica Beyond We’ve created a new place where questions are at the center of learning.This quiz is incomplete To play this quiz, please finish editing it. 100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians. Equator/ Prime Meridean/ Hemispheres DRAFT.
EQUATOR AND PRIME MERIDIAN HOW TO
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