Technology term
Penumbra
The lighter, outer part of a shadow, where only part of a light source is blocked. Observers inside the Moon's penumbra during an eclipse see the Sun partly, not fully, covered.
English
Penumbra
Arabic
الظل الجزئي (Penumbra)
First appeared in
The Moon Blocks Out the Sun Over Spain Tonight: Europe's First Total Eclipse Since 1999
