ephemeris meridian

См. также в других словарях:

• American Ephemeris and Nautical Almanac — The American Ephemeris and Nautical Almanac was published for the years 1855 to 1980, containing information necessary for astronomers, surveyors, and navigators. It was based on the original British publication, The Nautical Almanac and… …   Wikipedia

• Washington meridian — The Washington meridian was one of four prime meridians of the United States which passed through Washington, D.C.. The four which have been specified are: # through the Capitol # through the White House # through the old Naval Observatory #… …   Wikipedia

• Prime Meridian — 0° Prime Meridian …   Wikipedia

• ΔT — This article is about the time difference. For the temperature difference, see psychrometrics. ΔT vs. time from 1657 to 1984[1] ΔT, Delta T, delta T, deltaT, or DT is the time difference obtained by subtracting Universal Time (UT) from… …   Wikipedia

• Coordinated Universal Time — UTC redirects here. For other uses, see UTC (disambiguation). Coordinated Universal Time (abbreviated UTC) is the primary time standard by which the world regulates clocks and time. It is one of several closely related successors to Greenwich… …   Wikipedia

• The Nautical Almanac — This article is about the British official publications generically known by the name of The Nautical Almanac. For other uses including other nautical almanacs, see Nautical almanac (disambiguation). The Nautical Almanac has been the familiar… …   Wikipedia

• Tropical year — A tropical year (also known as a solar year), for general purposes, is the length of time that the Sun takes to return to the same position in the cycle of seasons, as seen from Earth; for example, the time from vernal equinox to vernal equinox,… …   Wikipedia

• Washington mean time — was the time at the meridian through the center of the old dome atop the main building at the old US Naval Observatory at Washington, D.C. This Washington meridian was defined on 28 September 1850 by the United States Congress (9 Stat. 515). The… …   Wikipedia

• Second — This article is about the unit of time. For other uses, see Second (disambiguation). A light flashing approximately once per second. The second (SI unit symbol: s; informal abbreviation: sec) is a unit of measurement of time, and is the… …   Wikipedia

• Solar time — On a prograde planet like the Earth, the sidereal day is shorter than the solar day. At time 1, the Sun and a certain distant …   Wikipedia

• Common Era — BCE redirects here. For other uses, see BCE (disambiguation). Era Vulgaris redirects here. For the Queens of the Stone Age album, see Era Vulgaris (album). Common Era (sometimes Current Era[1] or Christian Era[2]), abbreviated as CE, is an… …   Wikipedia