Lunar One is one of the Lunar colonies and is the site of a Terran Nationalist outpost that is destroyed by Eastern Alliance forces. Charlie Watts serves here during its fall, and is captured (TOS: "Experiment in Terra").
The Twelve Colonies of Man
Aeries | Caprica | Gemoni | Picon | Sagitaria | Scorpion | Taura | Virgon
Arcta | Borallus | Borella | Carillon | Equellus | Kobol | Orion
Cylon Holdings: Gamoray | Molecay
Colonial Descendant Holdings: Attila | Proteus | Sectar
Terra Holdings: Paradeen | Terra | Lunar colonies: Lunar One & Lunar Seven
Notables: Earth | Planetary System at the Edge of the Galaxy | Red planet