Méridián
Méridián is the Hungarian term for meridian, a great circle that passes through the North and South Poles, defining a line of longitude on the Earth's surface. Each meridian intersects the equator at a right angle and, together with its opposite meridian, forms a 180-degree half-circle. Longitudes are measured east or west from the prime meridian, which is defined as 0°. The most widely used prime meridian runs through Greenwich, England, chosen at the 1884 International Meridian Conference, which established a global standard for navigation and timekeeping. The full longitude system ranges from 0° at Greenwich to 180° east and west, with the 180th meridian approximately coinciding with the International Date Line.
In astronomy, a celestial meridian is the imaginary great circle that passes through the observer’s zenith
Méridián coordinates are essential for mapmaking, navigation, and timekeeping. Local solar noon occurs when the Sun
The term méridián is also used in Hungarian to denote any line of longitude. The concept of