Explanation: social studies ? these are questions for geography. 0 degrees latitude is the equator. 0 degrees longitude is the prime meridian (often called Greenwich). ;

The point at (0°, 0°) is not generally given a name

All geographers, cartographers and surveyors ought to know the following, but I reference some sources anyway:

According to Matt Rosenberg

The point at which the equator (0° latitude) and the prime meridian (0° longitude) intersect has no real significance but it is in the Gulf of Guinea in the Atlantic Ocean, about 380 miles (611 kilometers) south of Ghana and 670 miles (1078 km) west of Gabon.

Also, according to wiki/Geographic_coordinate_system#Geographic_latitude_and_longitude

The 0° parallel of latitude is designated the equator ...

The meridian of the British Royal Observatory in Greenwich, a little east of London, England, is the international Prime Meridian ... [is the 0° meridian]

...

The grid thus formed by latitude and longitude is known as the "graticule". The zero/zero point of this system is located in the Gulf of Guinea about 625 km (390 mi) south of Tema, Ghana.

And at Fact Monster's Geography Glossary:

Zero degrees (0°) latitude is the equator ... Zero degrees longitude (0°) is called the prime meridian.

While "the origin" might well work – after all, that is what we call (0, 0) on a plane coordinate system – the point at (0°, 0°), on a spheroidal system, is not generally given a name. Certainly, none of the above (3 refs) give it a name, and until now, I'd never heard of Null Island.

On the other hand, when referring specifically to geodetic coordinate systems, the use of the term "origin" usually refers to one of three things, none of which are at (0°, 0°):

• the very center of the ellipsoid representing the Earth (see wiki/Geodetic_datum#Other_Earth-based_coordinate_systems or wiki/World_Geodetic_System#Main_parameters)
• the datum or place, on the surface, used to relate the mathematical model and the physical Earth (see wiki/Geodetic_datum#Reference_datums)
• the center a map projection or standard lines of a given projection, where the distortion is zero (see geography.hunter.cuny.edu/~jochen...Map coordinate systems/Projection parameters or georeference.org/doc/lambert_conformal_conic) NB: The center of a map projection could very well be at (0°, 0°) but it is not generally so.

Final Answer: equator ;

Had to pick somewhere. Mapmakers started using the Royal Observatory at Greenwich, England as the "0" line and it caught on. http://en.wikipedia.org/wiki/Prime_meridian_(Greenwich)

Hint: Geographers, more specifically Cartographers have separated the Earth into a grid of imaginary lines that runs both in northern and southern hemispheres as well as in east and west. Complete answer: The lines that run horizontally around the earth are known as latitudes whereas the lines running in east and west are longitudes. The range of the distance between the north or south of the equator is the latitude. With the help of 180 imaginary lines, these latitudes are measured that form circles around the surface of the earth east and west. These imaginary lines are parallel to the equator. The Equator is the 0 degrees latitude, which is an imaginary line that circles the earth. This zero degree latitude separates the earth into two equal hemispheres. The equator lies exactly halfway between the two reference points, the North pole and South pole. The part of the globe that lies in the north is known as the northern hemisphere and the part that lies in the south is known as the southern hemisphere. The other important parallels of latitudes are the Tropic of Cancer, the Tropic of Capricorn, the Arctic Circle and the Antarctic Circle.The other set of circles which is drawn through the poles, running from North pole to South pole is known as the meridians of longitude or simply a meridian. The equator also cuts the meridians into two equal halves and it is defined as the zero degree longitude.Thus, the correct answer is option (A).Note: The parallels are circles that differ in length. The length of each parallel decreases gradually from the equator to the poles. The poles are just reference points and the longest parallels of latitude are the equator and the 60 degree parallel is half the length of the equator.