Kozai::Illumination::Shadow

In full sunlight.

Inside the penumbra: the Earth covers part of the Sun's disc but not all of it. The satellite is dimming, not dark.

Inside the umbra: no part of the Sun's disc is visible from it.

Whether any sunlight reaches it at all.

NOTE: true in the penumbra. The alternative — counting a partly lit satellite as eclipsed — would report it as vanishing several seconds before it fades, and the three-state value is reported alongside so that a caller wanting the stricter reading can have it.

Returns true if this enum value equals Penumbra

Returns true if this enum value equals Sunlit

The lower-case name used in the API.

Returns true if this enum value equals Umbra