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- Polar_orbit abstract "A polar orbit is one in which a satellite passes above or nearly above both poles of the body being orbited (usually a planet such as the Earth, but possibly another body such as the Sun) on each revolution. It therefore has an inclination of (or very close to) 90 degrees to the equator. A satellite in a polar orbit will pass over the equator at a different longitude on each of its orbits.Polar orbits are often used for earth-mapping, earth observation, capturing the earth as time passes from one point, reconnaissance satellites, as well as for some weather satellites. The Iridium satellite constellation also uses a polar orbit to provide telecommunications services. The disadvantage to this orbit is that no one spot on the Earth's surface can be sensed continuously from a satellite in a polar orbit.Near-polar orbiting satellites commonly choose a Sun-synchronous orbit, meaning that each successive orbital pass occurs at the same local time of day. This can be particularly important for applications such as remote sensing atmospheric temperature, where the most important thing to see may well be changes over time which are not aliased onto changes in local time. To keep the same local time on a given pass, the time period of the orbit must be kept as short as possible, this is achieved by keeping the orbit lower to the Earth. However, very low orbits of a few hundred kilometers rapidly decay due to drag from the atmosphere. A commonly used altitude is approximately 1000 km, which produces an orbital period of about 100 minutes. The half-orbit on the Sun side then takes only 50 minutes, during which local time of day does not vary greatly.To retain the Sun-synchronous orbit as the Earth revolves around the Sun during the year, the orbit of the satellite must precess at the same rate, which is not possible if the satellite were to pass directly over the pole. Because of the Earth's equatorial bulge, an orbit inclined at a slight angle is subject to a torque which causes precession; an angle of about 8 degrees from the pole produces the desired precession in a 100-minute orbit.A satellite can hover over one polar area much of the time, albeit at a large distance, using a polar highly elliptical orbit with its apogee above that area.".
- Polar_orbit wikiPageExternalLink orbmech.htm.
- Polar_orbit wikiPageID "355155".
- Polar_orbit wikiPageLength "3134".
- Polar_orbit wikiPageOutDegree "22".
- Polar_orbit wikiPageRevisionID "672280784".
- Polar_orbit wikiPageWikiLink Apogee.
- Polar_orbit wikiPageWikiLink Apsis.
- Polar_orbit wikiPageWikiLink Category:Articles_containing_video_clips.
- Polar_orbit wikiPageWikiLink Category:Astrodynamics.
- Polar_orbit wikiPageWikiLink Category:Earth_orbits.
- Polar_orbit wikiPageWikiLink Degree_(angle).
- Polar_orbit wikiPageWikiLink Earth_observation_satellite.
- Polar_orbit wikiPageWikiLink Equator.
- Polar_orbit wikiPageWikiLink Frequency.
- Polar_orbit wikiPageWikiLink Highly_elliptical_orbit.
- Polar_orbit wikiPageWikiLink Inclination.
- Polar_orbit wikiPageWikiLink Iridium_satellite_constellation.
- Polar_orbit wikiPageWikiLink List_of_orbits.
- Polar_orbit wikiPageWikiLink Longitude.
- Polar_orbit wikiPageWikiLink Molniya_orbit.
- Polar_orbit wikiPageWikiLink Orbit.
- Polar_orbit wikiPageWikiLink Orbital_inclination.
- Polar_orbit wikiPageWikiLink Precess.
- Polar_orbit wikiPageWikiLink Precession.
- Polar_orbit wikiPageWikiLink Reconnaissance_satellite.
- Polar_orbit wikiPageWikiLink Satellite.
- Polar_orbit wikiPageWikiLink Sun-synchronous_orbit.
- Polar_orbit wikiPageWikiLink Vandenberg_AFB.
- Polar_orbit wikiPageWikiLink Vandenberg_Air_Force_Base.
- Polar_orbit wikiPageWikiLink Weather_satellite.
- Polar_orbit wikiPageWikiLink File:Polar_orbit.ogg.
- Polar_orbit wikiPageWikiLinkText "Near-polar".
- Polar_orbit wikiPageWikiLinkText "PEO".
- Polar_orbit wikiPageWikiLinkText "Polar LEO".
- Polar_orbit wikiPageWikiLinkText "Polar orbit".
- Polar_orbit wikiPageWikiLinkText "Polar".
- Polar_orbit wikiPageWikiLinkText "near-polar orbit".
- Polar_orbit wikiPageWikiLinkText "near-polar".
- Polar_orbit wikiPageWikiLinkText "polar Earth orbit".
- Polar_orbit wikiPageWikiLinkText "polar circular earth orbit".
- Polar_orbit wikiPageWikiLinkText "polar orbit".
- Polar_orbit wikiPageWikiLinkText "polar trajectories".
- Polar_orbit wikiPageWikiLinkText "polar".
- Polar_orbit wikiPageWikiLinkText "polar-orbiting".
- Polar_orbit hasPhotoCollection Polar_orbit.
- Polar_orbit wikiPageUsesTemplate Template:Orbits.
- Polar_orbit wikiPageUsesTemplate Template:Reflist.
- Polar_orbit subject Category:Articles_containing_video_clips.
- Polar_orbit subject Category:Astrodynamics.
- Polar_orbit subject Category:Earth_orbits.
- Polar_orbit type Astrodynamic.
- Polar_orbit comment "A polar orbit is one in which a satellite passes above or nearly above both poles of the body being orbited (usually a planet such as the Earth, but possibly another body such as the Sun) on each revolution. It therefore has an inclination of (or very close to) 90 degrees to the equator.".
- Polar_orbit label "Polar orbit".
- Polar_orbit sameAs مدار_قطبي.
- Polar_orbit sameAs Полярна_орбита.
- Polar_orbit sameAs Òrbita_polar.
- Polar_orbit sameAs Polární_dráha.
- Polar_orbit sameAs Órbita_polar.
- Polar_orbit sameAs Polaarorbiit.
- Polar_orbit sameAs Orbite_polaire.
- Polar_orbit sameAs מסלול_קוטבי.
- Polar_orbit sameAs ध्रुवीय_कक्षा.
- Polar_orbit sameAs Poláris_pálya.
- Polar_orbit sameAs Orbit_polar.
- Polar_orbit sameAs Orbita_polare.
- Polar_orbit sameAs 極軌道.
- Polar_orbit sameAs Poliarinė_orbita.
- Polar_orbit sameAs Polaire_satellietbaan.
- Polar_orbit sameAs Polarbane.
- Polar_orbit sameAs Polarbane.
- Polar_orbit sameAs Orbita_okołobiegunowa.
- Polar_orbit sameAs Órbita_polar.
- Polar_orbit sameAs m.01zs38.
- Polar_orbit sameAs Полярная_орбита.
- Polar_orbit sameAs Polárna_dráha.
- Polar_orbit sameAs Polarna_orbita.
- Polar_orbit sameAs Polär_bana.
- Polar_orbit sameAs Kutupsal_yörünge.
- Polar_orbit sameAs Полярна_орбіта.
- Polar_orbit sameAs Q746711.
- Polar_orbit sameAs Q746711.
- Polar_orbit sameAs 极轨道.
- Polar_orbit wasDerivedFrom Polar_orbit?oldid=672280784.
- Polar_orbit isPrimaryTopicOf Polar_orbit.