Ephemerid: meaning, definitions and examples
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ephemerid
[ ɪˈfɛm.ə.rɪd ]
scientific term
An ephemerid is a term used in astronomy that refers to a table or data set that lists the positions of celestial bodies at regular intervals. These records are essential for navigation and for predicting the positions of planets, comets, and other astronomical objects over time.
Synonyms
astronomical table, ephemeris
Examples of usage
- The astronomer consulted the ephemerid to predict the comet's position.
- Nautical navigation relies heavily on ephemerids for accuracy.
- Ephemerids are crucial for mission planning in space exploration.
Word origin
The term 'ephemerid' is derived from the word 'ephemeris', which originates from the Latin term 'ephemeris', meaning 'daily'. It is further traced back to the Greek word 'ephēmeros' (ἐφήμερος), which translates to 'lasting a day' or 'transitory', made up of 'epi-' (upon) and 'hēmera' (day). Ephemeris was originally used in ancient times to refer to a calendar that included information about the positions and phases of celestial bodies, dates, and events. With advancements in astronomy, the term evolved, and ephemerids came to denote specific tables or data sets that represent the positions of planets and other celestial objects at designated times. As a result, ephemerids have played a crucial role in navigation and astronomical calculations throughout history.