More on umbra from Infoplease:

• sunspots - sunspots sunspots, dark, usually irregularly shaped spots on the sun's surface that are ...
• eclipse - eclipse eclipse [Gr.,=failing], in astronomy, partial or total obscuring of one celestial body by ...
• umbra: meaning and definitions - umbra: Definition and Pronunciation
• Suggestions for spelling of encyclopedia/umbra - The Infoplease spelling checker combines spelling help with our dictionary and thesaurus
• Umbra - Umbra Obsequious Umbra, in Garth's Dispensary, is Dr. Gould. Source: Dictionary of Phrase and ...

See more Encyclopedia articles on: Astronomy: General