umbra

The lighter one, called the penumbra, will not have too much effect but the umbra, the inner and darker shadow, will darken the Moon.

From BBC ● Sep. 17, 2024

In this case, about 3.5% of the moon will appear darkened by the Earth’s umbra, a term that describes the darkest segment of the Earth’s shadow.

From Los Angeles Times ● Sep. 17, 2024

Directly behind the Earth is its main shadow—very dark and narrow, and called the umbra.

From Slate ● Apr. 5, 2024

A solar eclipse occurs when a new moon aligns perfectly between Earth and the sun and briefly casts a shadow on our planet, called an umbra.

From National Geographic ● Oct. 2, 2023

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 Lytton, Edward Bulwer Lytton, Baron

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 Lytton, Edward Bulwer Lytton, Baron

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

From Ovington's Bank by Weyman, Stanley J.

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 Fernie, William Thomas

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 Bridges, Robert

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

From Time Magazine Archive

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

I won't say a word about mauves and faint ambers and umbras, but I do want to give that country a good word, as it looked that morning to me.

From The Range Dwellers by Bower, B. M.

Might we not print above his body the last words of the poem he seems to have loved so much: Fugit indignata sub umbras!

From The Jessica Letters: An Editor's Romance by More, Paul Elmer