Get the FREE one-click dictionary software for Windows
or the iPhone/iPad and Android apps
Noun: date of reference
  1. (astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded
    "The astronomer used January 1, 2000 as the date of reference for the star catalogue";
    - epoch

Derived forms: dates of reference

Type of: date