abutment, appulse, celestial equator, connection, ecliptic, fuel ship, insertion, meridian, period, space capsule, union
Definitionn. periapsis in Earth orbit
Last update: October 16, 2016
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The perigee comes closer to earth. [Please select]
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An Anomalistic month is the time in which the moon passes from perigee to perigee, &c. [noun]
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The problem of determining an orbit may be regarded as coeval with Hipparchus, who, it is supposed, found the moving positions of the apogee and perigee of the moon's orbit. [noun]
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The problem of determining an orbit may be regarded as coeval with Hipparchus, who, it is supposed, found the moving positions of the apogee and perigee of the moon's orbit. [Please select]
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It was a remarkable eclipse in that the Moon was within 13° of perigee and the Sun only 2° from apogee. [Please select]
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In the case of the moon, however, Ptolemy traced the variable inequality noticed sometimes by Hipparchus at first and last quarter, which vanished when the moon was in apogee or perigee. [Please select]
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In his planetary theory he found that the places given by his adopted excentric did not fit, being one way at apogee and the other at perigee; so that the centre of distance must be nearer the earth. [Please select]
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--In Ptolemy's excentric theory, A may be taken to represent the earth, C the centre of a planet's orbit, and E the equant, P (perigee) and Q (apogee) being the apses of the orbit. [Please select]
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Perigee: The point in the orbit of a celestial body when it is nearest to the earth. [Please select]
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Clairaut shall remove the perplexity occasioned by the seeming discrepancy between the observed and computed motions of the moon's perigee. [Please select]
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