We found 6 dictionaries that define the word ephemeris second:

General (3 matching dictionaries)

1. ephemeris second: Infoplease Dictionary
2. ephemeris second: Dictionary.com
3. Ephemeris second: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)

4. ephemeris second: Encyclopedia

Science (2 matching dictionaries)

5. Ephemeris Second: Eric Weisstein's World of Astronomy
6. Ephemeris Second: Extragalactic Astronomy

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