. "round-trip light time"@en-us . . . "0"^^ . . "114274034"@en-us . . . "15130926-n"^^ . "the elapsed time it takes for a signal to travel from Earth to a spacecraft (or other body) and back to the starting point"@en-us . . . . "RTLT"@en-us . "0"^^ . "115130926"^^ . "round-trip light time"^^ .