# Where longitude and latitude meet

### latitude and longitude | Description & Diagrams | piliciauskas.info

These lines are called parallels of latitude and meridians of longitude. . East and west longitude meet at the ˚ meridian, which runs through the Pacific. Volunteers participating in the project are aiming to visit 16, latitude and longitude integer degree intersections on Earth, taking. World Map /; Circles of Latitude & Longitude - The Equator, The Prime Meridian, The Tropic of Cancer and Capricorn.

Two of these imaginary reference lines, the equator and the prime meridian, are called primary reference lines because they are where we start the numbering system.

Equator, Hemispheres, Axis, and Directions The earth rotates daily about its axis.

Dr. Nagler's Laboratory: Longitude and Latitude

The north and south poles are the two imaginary points where the axis would enter and exit from the earth if the axis were a pole or a line see Fig. The equatoris the imaginary primary reference line drawn around the earth halfway between the north and south poles. The half of the earth to the north of the equator is the northern hemisphere; the half to the south is the southern hemisphere Fig. The prefix hemi- means "half"; thus, hemisphere means "half-sphere.

Movement toward the North Pole is northerly in direction. Movement toward the South Pole is southerly in direction.

Degrees of latitude are measured from an imaginary point at the center of the earth. If the earth was cut in half, this imaginary point would be intersected by a line drawn from the North Pole to the South Pole and by a line drawn from the equator on one side of the earth to the equator on the other Fig. A radius is a line drawn from the edge of a circle to its center.

To calculate the angle, draw a line from the point to the center of the earth and a line from the equator to the center of the earth Fig. Check Your Understanding Circle one answer: A latitude of 85 degrees would be far from the equator near the equator?

A longitude of degrees would be in England across the globe from England. Advanced reading below Latitude and Longitude: The Age of Exploration, which began about 1, AD, demanded a lot of information about distant locations to support travel and trade. Portuguese navigators, then later Spanish and English ships provided information about Africa, India, the Americas, and the Far East to European nations.

Russian navigators explored the Northern Pacific and North American coasts, as well as the interior of Asia.

## How the lines of latitude and longitude are drawn on a globe of Earth?

Older maps did not commonly have a vertical and horizontal grid overlaid on physical features. Convention arose at that time to use a system of horizontal lines on the globe called latitudes. The longest of these parallels is the equator. It is a circle positioned midway between the north and south poles. The parallel grid lines never meet, but they do get shorter in length as they approach the poles.

The second set of grid lines, perpendicular to the parallels is called longitude. All longitude lines meet at the north and south poles on the globe. Each point on the earth can be accurately and uniquely specified by a latitude and longitude. Cartographers agreed that the measurement of these grid lines would be in degrees, not any physical measure like meters. Sailors navigated by the stars, which had traditionally been measured using angular units. Navigators adopted the old convention of degrees in a circle for physical maps of the earth.

There is a natural way to measure latitude - angular distance up north or down south from the equator. The North Pole is 90 degrees north of the equator and the South Pole is 90 degrees south of the equator.

### Latitude and Longitude

The convention for longitude was more difficult to achieve; there is no natural way to start measuring meridians. English naval power became dominant in this time and English maps grew in accuracy. The English maps based measurement of meridians by the meridian that passed through the main street in Greenwich England and passed through the middle of the Royal Astronomical Observatory there.

Cartographers accepted the Greenwich meridian as the zero point for all other meridians. Longitude is measured east or west of the Greenwich meridian.

### The Greenwich Meridian - where east meets west: Latitude and Longitude

Because the earth is a sphere the number of kilometers between parallels one degree apart must remain the same. The circumference of the earth is about 40, km.

• 1. The Point Has No Name:
• …where east meets west