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Terrestrial Time replaced Ephemeris Time, ET
in Astronomy
Transit Traverse
in Astronomy
171077171076
Similar to TT
AZA - Analiza Zanieczyszczenia Atmosfery
B-V - Binary - Variable star
BAV - Bundesdeutsche Arbeitsgemeinschaft fur Veraenderliche Sterne
BBH - Big Black Hole
BBT - Big Bang Theory
BCG - Blue Compact Galaxy
BD - Brown Dwarf
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