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TT, terrestrial time, terrestrial dynamical time, TDT, ephemeris time | [in 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 | |
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Micronesia, Federated States of Micronesia, TT | a country scattered over Micronesia with a constitutional government in free association with the United States; achieved independence in 1986 | |
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TT, Palau, Republic of Palau | a republic in the western central Pacific Ocean in association with the United States |