How to use perigees in a sentence? Find typical usage patterns (collocations)/phrases/context for "perigees" and check conjugation/comparative form for "perigees". Mastering all the usages of "perigees" from sentence examples published by news publications.
This orbit also allowed it to study the boundary region of the magnetosphere as it skims the magnetopause at perigees. In the first two years the double lunar swing-by technique was used to keep apogees in the distant magnetotail. This involved 14 lunar flybys. In 1993 the computer that controls the Low Energy Particles experiment locked up.
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The orbit has evolved over time; the line of apsides has rotated southwards so that the distance at which the orbit crossed the magnetotail current sheet progressively reduced, and a wide range of dayside magnetopause crossing latitudes were sampled. Gravitational effects impose a long term cycle of change in the perigee (and apogee) distance, which saw the perigees reduce to a few 100 km in 2011 before beginning to rise again. The orbit plane has rotated away from 90 degrees inclination.
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If nothing were done, essentially all satellites with perigees below the top of the elevator would eventually collide with the elevator cable. Twice per day, each orbital plane intersects the elevator, as the rotation of the Earth swings the cable around the equator. Usually the satellite and the cable will not line up. However, except for synchronized orbits, the elevator and satellite will eventually occupy the same place at the same time, almost certainly leading to structural failure of the space elevator and destruction of the satellite.
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Polli, Silvio: Effetti meteorici, statistici e dinamici, sul livello dell'Adriatico settentrionale, Istituto Sperimentale Talassografico di Trieste. Because the timeframe of both oscillations is comparable to naturally occurring (yet independent) astronomical tides, the two effects overlap and reinforce each other. The combined effects are more significant at the perigees, which correspond to new moons, full moons and equinoxes. Should meteorological conditions (such as a strong scirocco wind blowing north along the major axis of the Adriatic basin) hamper the natural outflow of excess tidal water, high waters of greater magnitude can be expected in Venice.
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On 12 February 2019, mission controllers began the process of ending the Van Allen Probes mission by lowering the spacecrafts' perigees, which increases their atmospheric drag and results in their eventual destructive reentry into the atmosphere. This ensures that the probes reenter in a reasonable timespan, in order to pose little threat with regards to the problem of orbital debris. The probes were projected to cease operations by early 2020, or whenever they ran out of the necessary fuel to keep their solar panels pointed at the Sun. Reentry into the atmosphere is predicted to occur in 2034.
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Though the resolution of satellite photographs, which must be taken from distances of hundreds of kilometers, is usually poorer than photographs taken by air, satellites offer the possibility of coverage for much of the earth, including hostile territory, without exposing human pilots to the risk of being shot down. Ground-resolution distance achieved by KH-8 There have been hundreds of reconnaissance satellites launched by dozens of nations since the first years of space exploration. Satellites for imaging intelligence were usually placed in high-inclination low Earth orbits, sometimes in Sun-synchronous orbits. Since the film-return missions were usually short, they could indulge in orbits with low perigees, in the range of 100–200 km, but the more recent CCD- based satellites have been launched into higher orbits, 250–300 km perigee, allowing each to remain in orbit for several years.
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