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...

within the umbra, an annular eclipse when the observer is within the antumbra, and a partial eclipse when the observer is within the penumbra. During a...

In United States constitutional law, the penumbra includes a group of rights derived, by implication, from other rights explicitly protected in the Bill...

shadow, called an "umbra". For a non-point or "extended" source of light, the shadow is divided into the umbra, penumbra, and antumbra. The wider the light...

used. A broad source of light will cast nuances of shadow; umbra, penumbra and antumbra, as shown in the accompanying diagram. Photograms may be made...

gray area is the penumbra, in which a partial eclipse can be seen. An observer in the antumbra, the area of shadow beyond the umbra, will see an annular...

R S T U V X Z οὖλον in Liddell and Scott οὖλος in Liddell and Scott οὐρά in Liddell and Scott οὐρέω in Liddell and Scott οὐρανός in Liddell and Scott...

passes through Earth's penumbra, but the Earth's umbra misses the Moon. Partial Lunar Eclipse = The Moon passes through Earth's umbra, but not completely...

list of Greek and Latin roots, stems, and prefixes commonly used in the English language from P to Z. See also the lists from A to G and from H to O. Some...