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Maritime radionavigation-satellite service (MRNSS) is – according to Article 1.45 of the International Telecommunication Union's (ITU) Radio Regulations (RR) [49] – defined as «A radionavigation-satellite service in which earth stations are located on board ships.»
Satellite watching or satellite spotting is a hobby which consists of the observation and tracking of artificial satellites that are orbiting Earth. [1] People with this hobby are variously called satellite watchers, trackers, spotters, observers, etc.
First images and view of a sunset and sunrise over Earth at the same time, a solar eclipse by Earth (a celestial body other than the Moon), from the Moon's surface. [37] [38] April 30, 1967 First color image of Earth from another astronomical object's surface, the Moon's surface. [39] September 20, 1967 (released November 10th) [40] DODGE
Pine Gap is a joint United States-Australian satellite communications and signals intelligence surveillance base and Australian Earth station approximately 18 km (11 mi) south-west of the town of Alice Springs.
A Google Project Loon balloon. A geostationary balloon satellite (GBS) flies in the stratosphere (60,000 to 70,000 ft (18 to 21 km) above sea level) at a fixed point over the Earth's surface. At that altitude the air has 1/10 of its density is at sea level.
Louis Essen (right) and Jack Parry (left) standing next to the world's first caesium-133 atomic clock in 1955, at the National Physical Laboratory in west London.. The Scottish physicist James Clerk Maxwell proposed measuring time with the vibrations of light waves in his 1873 Treatise on Electricity and Magnetism: 'A more universal unit of time might be found by taking the periodic time of ...
Satellite time lapse imagery of Earth's rotation showing axis tilt. Earth's rotation period relative to the Sun—its mean solar day—is 86,400 seconds of mean solar time (86,400.0025 SI seconds). [156]
It communicates through the NASA Deep Space Network (DSN) to receive routine commands and to transmit data to Earth. Real-time distance and velocity data are provided by NASA and JPL. [4] At a distance of 164.0 AU (24.5 billion km; 15.2 billion mi) from Earth as of September 2024, [4] it is the most distant human-made object from Earth. [5]