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单词 topocentric
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topocentric
topocentric adj.
Brit. /ˌtɒpə(ʊ)ˈsɛntrɪk/
,
U.S. /ˌtɑpəˈsɛntrɪk/
Astronautics (of a parameter of a spacecraft or an orbit) measured relative to a point on the earth's surface (rather than its centre).
ΘΚΠ
society > travel > air or space travel > space flight > [adjective] > (put) in orbit > measured relative to earth's surface
topocentric1965
1965 P. R. Escobal Methods Orbit Determination vii. 241 The topocentric right ascension-declination of the unknown orbit at the three times..can be obtained as follows.
1976 Sci. Amer. June 70/2 Since the tracking stations are on the earth's surface, the direct measurements they provide of the spacecraft's radial parameters (range, velocity and acceleration) are topocentric rather than geocentric.
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