Orbit

An orbit was the state of a celestial object or spacecraft revolving around a star, planet, or moon, especially a periodic elliptical revolution.

Whilst in orbit of the planet Perfecton the IAC cruiser Winton completed an orbit of the planet every 2 hours. (PROSE: Oh No It Isn't!)

In the 1950s on Earth the British Rocket Group achieved several orbital flights. (PROSE: Who Killed Kennedy)

In 1997 the United Kingdom used an orbiter/lander arrangement for their spacecraft when they returned to Mars. (PROSE: The Dying Days)

Space stations
In the 26th century every colony had an orbital space station where ships could drop cargo without needing to make planetfall. (PROSE: Love and War)

Spaceports would also be used to facilitate the movement of smaller ships between interstellar ships in orbit and the planets that they orbited. (PROSE: Beige Planet Mars)

Spacecraft could also orbit space stations that were located in deep space in a similar manner as they would a planet. (PROSE: Shakedown)

Spacecraft orbits
Spacecraft (such as cruisers or shuttles) could orbit a planet in a powered orbit (PROSE: Dragons' Wrath, Father Time) or unpowered orbit which lead to a decayed orbit (and finally crashing back to the planet). (PROSE: Love and War)

Spacecraft could also maintain a geo-stationary orbit; maintaining a fixed position over the planet. (TV: Remembrance of the Daleks, PROSE: Another Girl, Another Planet) This was also known as geo-synchronous orbit or simply stationary orbit. (PROSE: Where Angels Fear, Twilight of the Gods)

Artificial satellite orbits
Artificial satellites were also launched into orbit and maintained by many civilisations for planetary communication, defence and geo-location (sometimes called geosats or GPS). (TV: Delta and the Bannermen, PROSE: War of the Daleks, The Sword of Forever, Tears of the Oracle) Some satellites had living beings within. (PROSE: Alien Bodies)

Planetary orbits
Thaon 5 was gravitationally locked and cycled through its phases once every 12 days that it completed an orbit. (PROSE: Tempest)

Tempest orbited a mildly unstable flare star every twenty hours. (PROSE: Tempest)

Inside the People's Dyson sphere they had a planet orbiting the star within it. (PROSE: The Also People)

Tyler's Folly orbited an obscure star in the Cygnus Mortis constellation. (PROSE: Down)

Mondas once orbited Earth. (TV: The Tenth Planet)

Other types of orbits
TARDISes could achieve a temporal orbit. (TV: Doctor Who)