Eclipse

Shadowing of satellites by moon and Earth provided as factor between $[0,1]$ with 0: full shadow and 1: full sun light.

Conical

eclipseConical
Figure: Modelling umbra and penumbra.

SOLAARS

Earth’s penumbra modeling with Solar radiation pressure with Oblateness and Lower Atmospheric Absorption, Refraction, and Scattering (SOLAARS). See Robertson, Robbie. (2015), Highly Physical Solar Radiation Pressure Modeling During Penumbra Transitions (pp. 67-75).