| IP Address: | Code: | Country: | Region: | City: |
|---|---|---|---|---|
| 3.238.250.73 | US | United States of America | Virginia | Ashburn |
| Latitude: | Longitude: | Time Zone: | Zip Code: |
|---|---|---|---|
| 39.04372 | -77.487488 | -04:00 | 20146 |
MARINUS OF TYRE: "His chief merits were that he assigned to each place its proper latitude and longitude, and introduced improvements in the construction of his maps." 'longitude' amended from 'longtitude'.
GPS coordinates are formed by two components that are a latitude , giving the north-south position, and a longitude, giving the east-west position.
| City: | Population: | Latitude: | Longitude: | Country: |
|---|
In geography, latitude is a geographic coordinate that specifies the north–south position of a point on the Earth's surface. Latitude is an angle (defined below) which ranges from 0° at the Equator to 90° (North or South) at the poles. Lines of constant latitude, or parallels, run east–west as circles parallel to the equator. Latitude is used together with longitude to specify the precise location of features on the surface of the Earth. On its own, the term latitude should be taken to be the geodetic latitude as defined below. Briefly, geodetic latitude at a point is the angle formed by the vector perpendicular (or normal) to the ellipsoidal surface from that point, and the equatorial plane. Also defined are six auxiliary latitudes that are used in special applications.
| Location | Coordinates |
|---|---|
| Arctic Circle | 66° 34′ (66.57°) N |
| Tropic of Cancer | 23° 26′ (23.43°) N |
| Tropic of Capricorn | 23° 26′ (23.43°) S |
| Antarctic Circle | 66° 34′ (66.57°) S |
Longitude is a geographic coordinate that specifies the east–west position of a point on the Earth's surface, or the surface of a celestial body. It is an angular measurement, usually expressed in degrees and denoted by the Greek letter lambda (λ). Meridians (lines running from pole to pole) connect points with the same longitude. The prime meridian, which passes near the Royal Observatory, Greenwich, England, is defined as 0° longitude by convention. Positive longitudes are east of the prime meridian, and negative ones are west.
Because of the Earth's rotation, there is a close connection between longitude and time. Local time varies with longitude: a difference of 15° longitude corresponds to a one-hour difference in local time, due to the differing position in relation to the Sun. Comparing local time to an absolute measure of time allows longitude to be determined. Depending on the era, the absolute time might be obtained from a celestial event visible from both locations, such as a lunar eclipse, or from a time signal transmitted by telegraph or radio. The principle is straightforward, but in practice finding a reliable method of determining longitude took centuries and required the effort of some of the greatest scientific minds.
