What are the imaginary lines around the earth called?

Answer 1

Are you talking about the equator which seperates the northern and southern hemisphere?

Answer 2

Lines of latitude circle the earth parallel to the equator. Each line represents an angular distance away from the equator. Thus, the lines run east and west and each line represents a distance north or south from the equator. For example, one might say that she is 20 degrees north. That means she's on the line of latitude 20 degrees from the equator in the northern hemisphere.

Lines of longitude circle the earth perpendicular to the equator. Each line represents an angular distance away from Greenwich, England (the "prime meridian"). These lines run north and south, but they measure a distance east or west. So someone might say that she is 30 degrees east. This means she's on the line of longitude that is 30 degrees east of Greenwich, England.

Usually someone gives their coordinates as in 20 degrees north by 30 degrees east. If you assume that the person is on the surface of the planet, then by using both the line of latitude and the line of longitude, you can pinpoint exactly where the person is on the globe.

Answer 3

there is an imaginary sphere around earth which is known as celestial sphere.
There are almost same methods of representing a point on the celestial sphere. In the celestial sphere : Equator is represented by equinoctial, Latitude are represented by Declination and instead of longitudes celestial meridians are used. the point directly above observer on earth is called Zenith and directly below is called Nadir.

Answer 4

Geodesics.

Answer 5

Latitude and Longitude :

A system of lines is used to find the location of any place on the surface of the Earth. Commonly called a grid system, it is made up of two sets of lines that cross each other. One set lines of latitude runs in an east-west direction. The other set lines of longitude runs in a north-south direction. Although these are only imaginary lines encircling the Earth, they can be drawn on globes and maps as if they actually existed.

Drawing the Earth Grid :
To draw the lines of the grid system on a globe or map, it is necessary to have starting points, or points of reference. There are two such points of reference on the Earth. These are the North Pole and the South Pole. The poles are the points at which the Earth's axis meets the Earth's surface. Halfway between the poles is an east-west line called the equator. It encircles the Earth and divides it into two equal parts, or hemispheres. The North Pole is in the hemisphere north of the equator the Northern Hemisphere. The South Pole is in the hemisphere south of the equator the Southern Hemisphere.
One set of lines in the Earth's grid system is drawn around the globe parallel to the equator. These are east-west lines, or lines of latitude. In the basic grid there are 89 such equally spaced lines to the north of the equator, 89 to the south. Where the 90th east-west lines would be are two points the North and South poles. Each east-west line is a circle. The farther it is from the equator the shorter its length. The 60th east-west line, for example, is only half as long as the equator.
East-west lines are numbered from 0 at the equator the east-west base line to 89 near the poles. The east-west lines between the equator and the North Pole are north of the equator; those between the equator and the South Pole, south of the equator. The city of New Orleans, La., is located on the 30th east-west line north of the equator. But many other places in the world are also situated on this line. That is why a second set of lines is needed to locate the exact position of New Orleans or of any other place.

The second set of lines in the Earth's grid system is drawn from pole to pole. These are north-south lines, or lines of longitude. One north-south line has been chosen by international agreement as the zero, or base line. It passes through Greenwich, England, a borough of London. In the basic grid there are 180 such equally spaced lines to the east of the Greenwich base line, 180 to the west. Unlike east-west lines, all north-south lines have the same length.

North-south lines are numbered from 0 at the north-south base line both east and west to the 180th north-south line. The zero line and the 180th line together form a complete circle that like the equator, cuts the Earth into two hemispheres. The half west of the zero line can be called the Western Hemisphere; the half east of the zero line, the Eastern Hemisphere.
The north-south lines and the east-west lines together form the global grid system used to find the exact location of any place on Earth. New Orleans, on the 30th east-west line north of the equator, is also on the 90th north-south line west of the north-south base line. Many places in the world among them, Memphis, Tenn.; East St. Louis, Ill.; and the Galapagos Islands of Ecuador are on or near the same north-south line as New Orleans. Many other places for example, Port Arthur, Tex.; St. Augustine, Fla.; and Cairo, Egypt are on or near the same east-west line as New Orleans. But only New Orleans is situated on both lines exactly where they cross each other. Likewise, each place in the world and only that place is situated at the intersection of a given east-west line and a given north-south line.

Parallels and Meridians :
All east-west lines are equidistant from each other. This means that they are all parallel to the equator and to each other. Every point on a given east-west line, therefore, is the same distance from the equator, the same distance from the North Pole, and the same distance from the South Pole. For this reason east-west lines, or lines of latitude, are commonly referred to as parallels of latitude, or simply parallels.
The north-south lines, or lines of longitude, also have another name. They are commonly referred to as meridians of longitude, or simply meridians. The zero meridian, or base line for numbering the north-south lines, is called the prime meridian.
Each meridian goes only halfway around the Earth from pole to pole. Each has a twin on the other side of the Earth. Like the prime meridian and the 180th meridian, all such pairs of meridians form circles that cut the Earth into hemispheres. These circles are known as great circles. Only one parallel, the equator, is a great circle.

Answer 6

equator, prime meridian, a bunch of other meridians... and i think on of them is also called the tropic of cancer, or the tropic of capricorn or something.

Answer 7

longitude and latitude

Answer 8

http://www.professores.uff.br/hjbortol/arquivo/2006.1/applets/earth_en.html


try it it is thebomb. keep scrooling down for more info

Answer 9

You're doing your homework now, aren't you?! Don't be lazy. Look it up in your textbook.

Answer 10

latitudes and longitudes