TDB (Baryzentrische Dynamische Zeit)
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<timefyi-glossary slug="tdb"></timefyi-glossary>Definition
Eine relativistische Zeitskala für Planetenephemireden, am Schwerpunkt des Sonnensystems gemessen. TDB berücksichtigt relativistische Effekte durch den variierenden Abstand der Erde zur Sonne und weicht von TT um weniger als 2 Millisekunden ab.