terrestrial : Idioms & Phrases
Index
terrestrial , or Erecting eyepiece
- an eyepiece used in telescopes for viewing terrestrial objects, consisting of three, or usually four, lenses, so arranged as to present the image of the object viewed in an erect position.
Webster 1913
terrestrial dynamical time
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noun (astronomy) a measure of time defined by Earth's orbital motion; terrestrial time is mean solar time corrected for the irregularities of the Earth's motions
terrestrial dynamical time; TT; ephemeris time; TDT.
WordNet
terrestrial guidance
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noun a method of controlling the flight of a missile by devices that respond to the strength and direction of the earth's gravitational field
WordNet
terrestrial planet
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noun a planet having a compact rocky surface like the Earth's; the four innermost planets in the solar system
WordNet
terrestrial time
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noun (astronomy) a measure of time defined by Earth's orbital motion; terrestrial time is mean solar time corrected for the irregularities of the Earth's motions
terrestrial dynamical time; TT; ephemeris time; TDT.