earth orbit

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earth orbit

[¦ərth ′ȯr·bət]
(astronomy)
The elliptical motion of the earth about the sun (eccentricity 0.01675, average radius 9.296 × 107 miles or 1.496 × 108 kilometers) in a sidereal year.
References in periodicals archive ?
On October 4, 1957, Moscow revealed to the world the news that the Soviets had successfully launched a 184-pound manmade satellite into a 96-minute geocentric orbit.
This was important for any solar calculation, because medieval theory placed the Sun in a geocentric orbit with the directions of apogee and perigee (called aux and opposite aux) at fixed positions among the stars in the "eighth sphere," which executed both a steady precession and an oscillating motion called trepidation relative to the vernal equinox point in the "ninth sphere.
Enspherics, founded in 1992, is a trusted provider of IT security services protecting essential data and systems for enterprises that operate in diverse environments; from under the sea to geocentric orbit to the Internet.