The Moon Sitter Mission provides a continuous observation of one of the Moon poles. Solar sails can produce equilibrium solutions which can be used so as to accomplish the Moon Sitter mission.

Solar sails are very light structures made of high reflective materials which are capable of using solar radiation for the primary propulsion system of a spacecraft. By producing a small but constant acceleration they can perform exotic orbits which would be unpractical with other propulsion systems. Equilibrium positions which are solutions of the restricted three-body problem of an Earth-Moon-sailcraft system can be exploited so as to observe high latitude regions of the Moon, as shown in Figure.