Ephemeris time
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- Atomic Time-Keeping from 1955 to the Present
- Time Scales in Astronomical and Navigational Almanacs
- Ephemeris Time (ET, Also Referred to As Barycentric Dynamical Time, TDB) – Coordinated Universal Time (UTC)
- Julian Day 11
- The Leap Second: Its History and Possible Future
- Definitions of Time and Frequency Standard
- 198 9MNRAS.2 38.152 9H Mon. Not. R. Astr. Soc. (1989) 238,1529-1535
- UTC and the Leap Second
- A Matter of Time the Arrival of a New Type of Timekeeper Heralds the End of the Second As We Know It, As Helen Margolis Explains
- Tropical Year
- The Mean-Solar-Time Origin of Universal Time and Utc Aas
- Astronomical Time Standards & Conversions
- The Observer's Handbook 1963
- GPS and Leap Seconds: Time to Change?
- SOFA Time Scale and Calendar Tools