umbra

The Moon will begin to enter the Earth's darkest shadow, known as the umbra, at around 03:33 BST on Friday morning.

From BBC ● Aug. 27, 2026

At the eclipse's maximum point, about 93% of the Moon's diameter will lie within Earth's dark central shadow, known as the umbra.

From Science Daily ● Aug. 5, 2026

When the moon is within the umbra, the darkest part of Earth’s shadow, it looks red-orange, giving the eclipse the name “blood moon.”

From Los Angeles Times ● Mar. 11, 2025

And when the moon is fully in the umbra, that’s a total eclipse.

From Slate ● Apr. 5, 2024

All were in the umbra of the magnificent hemlock.

From "Frightful's Mountain" by Jean Craighead George

But the ancient habitues—the magni nominis umbrae, contemporaries of Brummell in his zenith, boon companions of George IV. in his regency—still haunted the spot.

From My Novel — Complete by Edward Bulwer Lytton, Baron Lytton

But the ancient /habitues/—the /magni nominis umbrae/, contemporaries of Brummell in his zenith, boon companions of George IV. in his regency— still haunted the spot.

From My Novel — Volume 11 by Edward Bulwer Lytton, Baron Lytton

The Justices of that day bore a heavier burden than their successors--hodie nominis umbrae.

From Ovington's Bank by Stanley J. Weyman

Plato truly believ'd his archetypal Idēas to possess the fourth dimension: For since our solid is triple, but always Its shade only double, solids as umbrae Must lack equally one dimension also.

From The Poetical Works of Robert Bridges by Robert Bridges

Virgil thought the odour exhaled by the Juniper tree noxious, and he speaks of the Juniperis gravis umbra:—     "Surgamus! solet esse gravis cantantibus umbra;     Juniperis gravis umbra; nocent et frugibus umbrae."

From Herbal Simples Approved for Modern Uses of Cure by William Thomas Fernie

Occasionally, the penumbras of two sunspots of opposite polarity merge as they move past each other, putting the oppositely charged umbras in contact.

From Time Magazine Archive

The darker central portions of sunspots, or umbras, have the strongest magnetic fields; the lighter exteriors, or penumbras, the weaker fields.

From Time Magazine Archive

"Because the umbras have opposite polarities, they attract each other," says the Marshall Center's Moore.

From Time Magazine Archive

For the segnatura, which took place on certain days of the week, he selected on each occasion some new shady retreat "novas in convallibus fontes et novas inveniens umbras, quæ dubiam jacerent electionem."

From The Great Events by Famous Historians, Volume 07 by Rossiter Johnson

So Brother Copas had told her, to himself repeating— "Cras amorum copulatrix inter umbras arborum Inplicat casas virentes de flagello myrteo...."

From Brother Copas by Sir Arthur Thomas Quiller-Couch