The starting point of the skydiving on Ceti Alpha V holoprogram
Skydiving was a recreational sport which involved controlled descent from high altitudes without an aircraft.
Skydiving from exospheric altitudes was considered orbital skydiving. (VOY: "Extreme Risk")
The USS Protostar had a holodeck program for skydiving on Ceti Alpha V. In 2383, Hologram Janeway brought up the program to show Dal R'El and Jankom Pog the holodeck's capabilities. (PRO: "Kobayashi")