TDT vs terrestrial time

TDT and terrestrial time both are nouns.

Word	Noun	Adjective	Verb	Adverb
TDT	Yes	No	No	No
terrestrial time	Yes	No	No	No

As nouns, TDT and terrestrial time are synonyms defined as:

TDT and terrestrial time: (astronomy) a measure of time defined by Earth's orbital motion; terrestrial time is mean solar time corrected for the irregularities of the Earth's motions

Other synonyms of TDT include ephemeris time, terrestrial dynamical time, TT.

TDT (noun)	terrestrial time (noun)
(astronomy) a measure of time defined by Earth's orbital motion; terrestrial time is mean solar time corrected for the irregularities of the Earth's motions	(astronomy) a measure of time defined by Earth's orbital motion; terrestrial time is mean solar time corrected for the irregularities of the Earth's motions