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

When the moon passes partially into the umbra, it creates a partial eclipse, which looks as if there’s been a bite taken out of the moon.

From Slate ● Apr. 5, 2024

“Having once stood in the umbra, the Moon’s shadow, during a solar eclipse, we are driven to do so again and again, whenever the Moon moves between the Earth and the Sun.”

From New York Times ● Apr. 2, 2024

All were in the umbra of the magnificent hemlock.

From "Frightful's Mountain" by Jean Craighead George

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

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.

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

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

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

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

"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 'novos in convallibus fontes et novas inveniens umbras, quae dubiam facerent electionem.'

From The Civilisation of the Renaissance in Italy by Burckhardt, Jacob

Charpentier's note-book only contained this line, which he had written in the darkness at the foot of the barricade while Denis Dussoubs was speaking:— Admonet et magna testatur voce per umbras.

From The History of a Crime The Testimony of an Eye-Witness by Hugo, Victor