semidiameter of the earth

См. также в других словарях:

• semidiameter — noun The apparent radius of a star etc, when viewed from Earth …   Wiktionary

• solar parallax — noun the angle subtended by the mean equatorial radius of the Earth at a distance of one astronomical unit • Hypernyms: ↑geocentric parallax, ↑diurnal parallax * * * noun : the parallax of the sun being the angle subtended at the sun by the… …   Useful english dictionary

• Solar parallax — The parallax of the sun, that is, the angle subtended at the sun by the semidiameter of the earth. It is 8. 80, and is the fundamental datum. [Webster 1913 Suppl.] …   The Collaborative International Dictionary of English

• Intercept method — The Intercept Method , or Marcq St Hilaire method , as it is also rather inaccurately known, is an astronomical navigation method of calculating an observer s position on earth. It was originally called the azimuth intercept method because the… …   Wikipedia

• Lunar distance (navigation) — For the history of the lunar distance method, see History of longitude. Finding Greenwich time while at sea using a lunar distance. The Lunar Distance is the angle between the Moon and a star (or the Sun). The altitudes of the two bodies are used …   Wikipedia

• Equinox — This article is about the astronomical event when the sun is at zenith over the Equator. For other uses, see Equinox (disambiguation). For the same event happening on other planets and setting up a celestial coordinate system, see Equinox… …   Wikipedia