- Darker part of a sunspot - In astronomy, what term refers to the darkest part of a shadow during an eclipse? - Shade - Shadow - Shadow cast during an eclipse - The conical shadow projected from a planet or satellite, on
the side opposite to the sun, within which a spectator could see no
portion of the sun's disk; -- used in contradistinction from penumbra.
See Penumbra. - The central dark portion, or nucleus, of a sun spot.