The meaning of PENUMBRA is a space of partial illumination (as in an eclipse) between the perfect shadow on all sides and the full light. How to use penumbra in a sentence. Did you know?

The umbra, penumbra and antumbra are three distinct parts of a shadow, created by any light source after impinging on an opaque object. Assuming no diffraction, for a collimated beam (such as a point source) of light, only the umbra is cast.

of, causing, or being the partial shadow outside the complete shadow of an opaque body, such as a planet, where the light from the source of illumination is only partly cut off: Compare umbral …

A penumbral lunar eclipse occurs when the Sun, Earth, and the Moon are imperfectly aligned. When this happens, the Earth blocks some of the Sun's light from directly reaching the Moon's surface and covers all or part of the Moon with the outer part of its shadow.

6 天之前 · DISCLAIMER: These example sentences appear in various news sources and books to reflect the usage of the word ‘penumbral'. Views expressed in the examples do not represent …

What does the adjective penumbral mean? There are two meanings listed in OED's entry for the adjective penumbral . See ‘Meaning & use’ for definitions, usage, and quotation evidence.

2023年5月1日 · A penumbral eclipse happens when the moon passes into the lighter outer region of the Earth's shadow which is called the penumbra.

A partial shadow, as in an eclipse, between regions of complete shadow and complete illumination. 2. The diffuse outer part of a sunspot. 3. An area in which something exists to a lesser or uncertain degree: "The First Amendment has a penumbra where privacy is protected from governmental intrusion" (Joseph A. Califano, Jr.). 4.

2024年1月1日 · In a lunar eclipse, Earth’s shadow falls on the moon. And if the moon passes through the dark central shadow of Earth – the umbra – a partial or total lunar eclipse takes place. Then, if the moon...

PENUMBRA definition: 1. a part of a shadow in which only some of the light is blocked, used especially about a shadow…. Learn more.