#elapsed_time__elapsedtime the time that elapses while some event is occurring
supertype: time_period__period__period_of_time an amount of time; "a time period of 30 years"; "hastened the period of his recovery"
subtype: one-way_light_time__onewaylighttime__OWLT the elapsed time it takes for light (or radio signals) to travel between the Earth and a celestial object
subtype: round-trip_light_time__RTLT the elapsed time it takes for a signal to travel from Earth to a spacecraft (or other body) and back to the starting point
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