What is an umbra? Earth Science Earth, Moon, and Sun The Sun and Earth-Moon System 1 Answer Suryin =) Oct 20, 2015 A small completely dark, inner area of shadow. Answer link Related questions How often does each location on Earth experience a total solar eclipse? What is the only phase of the moon during which a solar eclipse can occur? Why? What is a penumbral eclipse? What is happening when the phases of the moon are waxing? What is syzygy? What is a spring tide and what causes this phenomenon? What causes a lunar eclipse? What causes a solar eclipse? What are the conditions under which an eclipse (both solar and lunar) will occur? What causes spring and neap tides? See all questions in The Sun and Earth-Moon System Impact of this question 3592 views around the world You can reuse this answer Creative Commons License