Light hour

One light hour is the distance that light travels in one Earth hour.

In 2346, the USS Intrepid (NCC-38907) was 42.7 light hours from Khitomer when the starship made its first sensor contact of the planet. 

In 2367, Lieutenant Commander Data reported that there was an M-class planet approximately three light hours from the position of the USS Enterprise (NCC-1701-D) at that time. 

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Светлинен час Lichtstunde Ora luce