Barycentric Dynamical Time (TDB)Barycentric Dynamical Time is one of the two barycentric time scales that lunar time work has to convert to. The LTE440 lunar time ephemeris calculates the relation of Lunar Coordinate Time to it and to Barycentric Coordinate Time.Related termsDerived fromBarycentric Coordinate TimeTCBOther terms worth reading next.EphemerisLunar Time Ephemeris LTE440LTE440Coordinate timeAll thirty entries are in the glossary of lunar timekeeping.SourcesLunar Time Ephemeris LTE440: definitions, algorithm and performance — Xu Lu, Tian-Ning Yang, Yi Xie, Purple Mountain Observatory, Chinese Academy of Sciences — Astronomy & Astrophysics 704, A76, 23 September 2025. Peer-reviewed. Verified 23 August 2026.Lunar Time Ephemeris LTE440: User Manual — Xu Lu, Tian-Ning Yang, Yi Xie — arXiv:2506.19213, 24 June 2025. Peer-reviewed. Verified 23 August 2026.Last verified 23 August 2026