The first equatorial spacecraft ( Tan Ce 1, Chinese for ' Explorer 1 ', also known as TC-1 ) was launched by a Long March 2C launch vehicle on December 29, 2003 at 19: 06 UT.

The mission formally ended on October 14, 2007 when the TC-1 spacecraft re-entered the Earth's atmosphere after being decommissioned ( an unavoidable consequence of its equatorial orbit ).

TC-1 was launched into an equatorial elliptical orbit of 570 x 78 970 km with inclination 28. 5 ° to the equator from the Xichang Satellite Launch Center.

It consists of two satellites: an Equatorial satellite ( TC-1 ) and Polar satellite ( TC-2 ).

The mission computer used aboard Skylab was the IBM System / 4Pi TC-1, a relative of the AP-101 Space Shuttle computers.

A statite, a hypothetical satellite that uses a solar sail to modify its orbit, could theoretically hold itself in a geostationary " orbit " with different altitude and / or inclination from the " traditional " equatorial geostationary orbit.

A satellite in a synchronous orbit that is both equatorial and circular will appear to be suspended motionless above a point on the orbited planet's equator.

It has also been proposed that Saturn's satellite Iapetus possessed a subsatellite in the past ; this is one of several hypotheses that have been put forward to account for its equatorial ridge.

Twice during the orbital cycles of Jupiter and Saturn, the equatorial ( and satellite ) planes of those planets are aligned with earth's orbital plane, resulting in a series of mutual occultations and eclipses between the moons of these giant planets.

A satellite is said to occupy an inclined orbit around the Earth if the orbit exhibits an angle other than zero degrees with the equatorial plane.

However, recent satellite tracked animals by Spanish and German researchers have demonstrated an inland route through the Sahara Desert, the equatorial rainforests until reaching Kenya and Mozambique.

The loss of the motor caused AO-40 to be left in an equatorial orbit that the satellite was not designed for.

Under his guide Italy became the third country in the world to build and operate a satellite in orbit around the Earth and the first country to deploy an equatorial launching pad, the San Marco, and to experiment successful launching from it.

The Laplace plane arises because the equatorial oblateness of the parent planet tends to cause the orbit of the satellite to precess around the polar axis of the parent planet's equatorial plane, while the solar perturbations tend to cause the orbit of the satellite to precess around the polar axis of the parent planet's orbital plane around the Sun.

In most cases, the Laplace plane is very close to the equatorial plane of its primary planet ( if the satellite is very close to its planet ) or to the plane of the primary planet's orbit around the Sun ( if the satellite is far away from its planet ).

Laplace found that the effects of the solar perturbing force, and of the planet ’ s oblateness ( its equatorial bulge ), together gave rise to an " inclinaison propre ", an " own inclination ", in the plane of the satellite orbits, relative to the plane of Jupiter ’ s equator.

Special cases of the sun-synchronous orbit are the noon / midnight orbit, where the local mean solar time of passage for equatorial longitudes is around noon or midnight, and the dawn / dusk orbit, where the local mean solar time of passage for equatorial longitudes is around sunrise or sunset, so that the satellite rides the terminator between day and night.

The satellite was launched via a Zenit 3SL rocket from Sea Launch ’ s Odyssey equatorial platform on April 26, 2005.

Polar mounts can use a simplified one axis design because geostationary satellite are fixed in the sky relative to the observing dish and their equatorial orbits puts them all in a common line that can be accessed by swinging the satellite dish along a single arc approximately 90 degrees from the mount's polar axis.

In the northern latitudes, the informal term equatorial constellation has sometimes used for constellations that lie to the south of the circumpolar constellations.

They show a peculiar distribution, with the peripatids being predominantly equatorial and tropical, while the peripatopsids are all found in what used to be Gondwana.

In astronomy and celestial navigation, the hour angle is one of the coordinates used in the equatorial coordinate system to give the direction of a point on the celestial sphere.

The equatorial radius is often used to compare Earth with other planets.

Celestial coordinate systems most commonly used in astronomy are equatorial coordinates and ecliptic coordinates.

( Sometimes the word ' equinox ' may be used alone, e. g. where it is obvious from the context to users of the data in which form the considered astronomical variables are expressed, in equatorial form or ecliptic form.

The mounting in 1859 of an equatorial of 330 mm ( 13 inch ) aperture evoked the comment in his journal for that year, " There is not now a single person employed or instrument used in the observatory which was there in Mr Pond's time "; and the transformation was completed by the inauguration of spectroscopic work in 1868 and of the photographic registration of sunspots in 1873.

( In practice, the two defining numbers are usually the equatorial radius and the reciprocal of the flattening, rather than the flattening itself ; for the WGS84 spheroid used by today's GPS systems, the reciprocal of the flattening is set at 298. 257223563 exactly.

The observatory contains many other notable telescopes, among them the telescope that utilizes an equatorial mount uncommon for radio telescopes, three telescopes forming the Green Bank Interferometer, a telescope used by school groups and organizations for small scale research, a fixed radio ' horn ' built to observe Cygnus X-1, a bunk house to facilitate these guests, as well as a reproduction of the original antenna built by Karl Jansky while he worked for Bell Labs to detect the interference that was discovered to be previously unknown natural radio waves emitted by the universe.

It housed a powerful mechanical equatorial reflector which was used in 1909 to formally discredit the Martian canal theory ( histoire du Pic du Midi de Bigorre ).

* German equatorial mount, or dovetail plate, used to fix a telescope to its mount

On smaller telescopes an equatorial platform is sometimes used to add a third " polar axis " to overcome these problems, providing an hour or more of motion in the direction of right ascension to allow for astronomical tracking.

The disadvantage is that one must start with highly accurate figures in the first place, or the results will drift away from the reality in time ; that one gets x, y, z positions which are often first to be transformed into more practical ecliptical or equatorial coordinates before they can be used ; and that it is an all or nothing approach.

Megathermal climates are sometimes split into two temperature-based subsets — equatorial and tropical ( the latter used here in the sense of " outer tropical ") — with " equatorial " denoting little or no variation in temperature throughout the year and " tropical " denoting significant seasonal variation, even though no month has an average temperature of below 18 ° C.

Isaac Roberts developed a technique of " piggyback " astronomical photography, mounting the camera / lens on a larger equatorial mounted telescope that was used as a " guidescope ".

Guo used a quadrangular spherical pyramid, the basal quadrilateral of which consisted of one equatorial and one ecliptic arc, together with two meridian arcs, one of which passed through the summer solstice point ... By such methods he was able to obtain the du lü ( degrees of equator corresponding to degrees of ecliptic ), the ji cha ( values of chords for given ecliptic arcs ), and the cha lü ( difference between chords of arcs differing by 1 degree ).

In geophysics, the term is used to refer to a wavy almost-circular region produced by perturbing the equatorial current sheet in a magnetic field whose shape resembles a tutu sticking out from a ballerina's waist.

With the exception of the Bolshoi Teleskop Azimutalnyi ( BTA-6 ) and William Herschel's 40-foot telescope, major optical telescopes prior to the MMT used equatorial mounts.

For several decades, the term tropical spastic paraparesis was used to describe a chronic and progressive clinical syndrome that affected adults living in equatorial areas of the world.

As Apollo 14 was an early Apollo mission, landing sites were restricted to equatorial regions for technical reasons.

Originally the teachers communicated with the children via radio, but now satellite telecommunication is used instead.

This standard is used by several mobile phone companies, including the Globalstar satellite phone network.

* CDMA has been used in the OmniTRACS satellite system for transportation logistics.

Services to Tasmania and the Northern Territory took longer to start, not until the mid 2000s when the digital satellite pay television service had picked up momentum and was beginning to be used for metropolitan installs and not just rural installs.

In addition to the direct applications ( mp3 players or computers ), digitally compressed audio streams are used in most video DVDs ; digital television ; streaming media on the internet ; satellite and cable radio ; and increasingly in terrestrial radio broadcasts.

A radome at RAF Menwith Hill, a site with satellite downlink capabilities believed to be used by ECHELON.

The ability to intercept communications depends on the medium used, be it radio, satellite, microwave, cellular or fiber-optic.

Some of this work employed infrared technology — previously used for satellite imaging — to detect previously unknown material by Euripides in fragments of the Oxyrhynchus papyri, a collection of ancient manuscripts held by the university.

These double-balanced mixers are very widely used in microwave communication systems, satellite communication systems, and ultrahigh frequency ( UHF ) communications transmitters and receivers, and in radar systems transmitters and receivers.

He designed the first instruments used in satellites to measure cosmic radiation and ozone, and in 1951 or 1952 designed the MOUSE (" Minimal Orbital Unmanned Satellite, Earth "), a proposed satellite that would contain Geiger counters for measuring cosmic rays, photo cells for scanning the Earth, telemetry electronics for sending data back to Earth, a magnetic data storage device, and rudimentary solar energy cells.

The first satellite navigation system, Transit, used by the United States Navy, was first successfully tested in 1960.

In 1964, the United States Army orbited its first SECOR ( Sequential Collation of Range ) satellite used for geodetic surveying.

TELE Greenland first used satellite communication in 1978 and currently utilizes Intelsat and Eutelsat.

Beginning in the early 1970s, the liquid fuelled DF-5 ICBM was developed and used as a satellite launch vehicle in 1975.

The funding was also used to reward journalists and academics who followed the Saudis ' strict interpretation of Islam ; and satellite campuses were built around Egypt for Al Azhar, the world's oldest and most influential Islamic university.

ISDN via satellite is used by field reporters around the world.

Low-Earth orbit is sometimes used to cut this delay, at the expense of more complicated satellite tracking on the ground and requiring more satellites in the satellite constellation to ensure continuous coverage.

The Mercury program also used a Scout rocket for a single flight, Mercury-Scout 1, which was intended to launch a small satellite designed to evaluate the worldwide Mercury Tracking Network.

It was used in digital satellite / cable TV services before MPEG-2 became widespread.

MPEG-2 is widely used as the format of digital television signals that are broadcast by terrestrial ( over-the-air ), cable, and direct broadcast satellite TV systems.

Also, OS / 2 was used for the host PC used to control the Satellite Operations Support System equipment installed at NPR member stations from 1994 to 2007, and used to receive the network's programming via satellite.

SOSS was a computer-controlled system using OS / 2 that NPR member stations used to receive programming feeds via satellite.