Nonsphericity of the Moon and Near Sun-Synchronous Polar Lunar Orbits

Table 2

Critical inclination for the potential of first order, where: 𝜀=613.573; 𝛿=67.496.

Longitude of the ascending node (h)	Critical inclination for direct orbits (ic)	Critical inclination for retrograde orbits (ic)
1 rad	61.10°	118.90°
2 rad	59.98°	120.02°
𝜋/2	58.56°	121.45°
𝜋/3	60.69°	119.31°
𝜋	72.83°	107.17°