The map is from Sid Meier's Alpha Centauri, a game from 25 years ago, a spinoff of the Civilization series, where a colony ship from Earth lands on a planet orb

The map is from Sid Meier's Alpha Centauri, a game from 25 years ago, a spinoff of the Civilization series, where a colony ship from Earth lands on a planet orbiting Alpha Centauri. In the game's narrative, the colonists use "planetfall" to refer to the landing event and date.