umbra

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Synonyms for umbra

comparative darkness that results from the blocking of light rays

Words related to umbra

a region of complete shadow resulting from total obstruction of light

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References in periodicals archive ?
However the calculations equally apply to both the Moon's umbra during a total eclipse and the antumbra during an annular eclipse.
In it, the antumbra cast by the moon covered almost the whole of the Peloponnesus but none of the cities of the northern Aegean coast.
21) An annular eclipse casts an antumbra rather than an umbra; see Figure 3.
There's also a "generic" globe with parallels and circles of longitude but no actual geographical features, on which the antumbra is projected orthographically as seen from the Sun.
Interestingly, the passage of the antumbra over Earth was described by Euler as Erd-Finsternis ("terrestrial eclipse").