Observation deck
From Memory Alpha, the free Star Trek reference
The observation deck is an area aboard Constitution-class starships located along the upper-portion of the hangar deck in the secondary hull. From this location, one could observe either the flight deck or outside the vessel through viewports.
In 2266, the observation deck was a stop on the guided tour conducted by Captain James T. Kirk for Lenore Karidian. (TOS: "The Conscience of the King")
In 2268, the USS Enterprise was detailed to transport delegates to the Babel Conference. A number of dignitaries lined the observation deck to see the reception of the Vulcan delegation. Later during that voyage, Ambassador Sarek made use of the observation deck for meditation. (TOS: "Journey to Babel")
 On the observation deck |
 As seen from the hangar deck |
