- reference epoch
- Космонавтика: базовая эпоха
Универсальный англо-русский словарь. Академик.ру. 2011.
reference epoch
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Epoch (astronomy) — In astronomy, an epoch is a moment in time used as a reference for the orbital elements of a celestial body. [cite book|last=Soop|first=E. M.|title=Handbook of Geostationary Orbits|publisher=Springer|date=1994|isbn=9780792330547] Typically, the… … Wikipedia
Epoch (reference date) — In the fields of chronology and periodization, an epoch means an instant in time chosen as the origin of a particular era. The epoch then serves as a reference point from which time is measured. Time measurement units are counted from the epoch… … Wikipedia
Epoch — PeriodizationIn periodization, epoch can refer to:* Epoch (reference date) A defining moment in the beginning of, or characteristic of, a distinctive historical period or era. * On the geologic time scale, a span of time smaller than a period and … Wikipedia
epoch — /ep euhk/ or, esp. Brit., /ee pok/, n. 1. a particular period of time marked by distinctive features, events, etc.: The treaty ushered in an epoch of peace and good will. 2. the beginning of a distinctive period in the history of anything: The… … Universalium
epoch — ep•och [[t]ˈɛp ək[/t]] esp. brit. [[t]ˈi pɒk[/t]] n. 1) a period of time marked by distinctive features, noteworthy events, changed conditions, etc.: an epoch of peace[/ex] 2) the beginning of a distinctive period in the history of anything 3) a… … From formal English to slang
epoch — /ˈipɒk / (say eepok), /ˈɛpɒk / (say epok) noun 1. a particular period of time as marked by distinctive character, events, etc. 2. the beginning of any distinctive period in the history of anything. 3. a point of time distinguished by a particular …
epoch — noun Etymology: Medieval Latin epocha, from Greek epochē cessation, fixed point, from epechein to pause, hold back, from epi + echein to hold more at scheme Date: 1614 1. a. an event or a time marked by an event that begins a new period or… … New Collegiate Dictionary
Julian epoch — (J) a measure of time used in astronomy. The word epoch comes from Greek, and means a fixed or standard instant of time. Other times are stated with reference to this fixed time using years and fractions of years. In 1984, astronomers agreed… … Dictionary of units of measurement
European Terrestrial Reference System 1989 — The European Terrestrial Reference System 1989 (ETRS89) is a ECEF (Earth Centered, Earth Fixed) geodetic Cartesian reference frame, in which the Eurasian Plate as a whole is static. The coordinates and maps in Europe based on ETRS89 are not… … Wikipedia
date of reference — noun (astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded • Syn: ↑epoch • Topics: ↑astronomy, ↑uranology • Hypernyms: ↑date … Useful english dictionary
Julian day — JDN redirects here. For the military IT system, see Joint Data Network. For the comic book character Julian Gregory Day, see Calendar Man. Not to be confused with Julian year (disambiguation). Julian day is used in the Julian date (JD) system of… … Wikipedia
