Canis Major

Canis Major was a constellation.

The Canis Major Constellation was partially visible on a viewscreen in the briefing room on the USS Enterprise (NCC-1701) in 2266. It was a star chart of the winter sky as seen from Earth. The constellation Canis Major was visible in the lower left corner of the chart and identified by name. 

Related link

 * Sirius (Alpha Canis Majoris; possibly aka Alpha Majoris)