2/27/2024 0 Comments Define umbraAlso, “penumbra” was coined by Johannes Kepler whereas the coining of “umbra” is not attributed to anyone in particular. “Umbra” means “shadow” while “penumbra” means “to hang on the shadow” or “almost a shadow”. We are very familiar with the earth’s umbra as it is what we know as “night”.ĭifference between Penumbra and Umbra Etymology Moreover, it is the innermost dark area of a sunspot. It is also defined as the shadow’s conical part which is caused by the exclusion of light. The umbra is the darkest part of a shadow and it is the one directly behind the object which a light source impinges on. This definition was derived from its Latin counterpart which is “shadow” or “shade”. “Umbra” was figuratively used in the 1590s to denote “ghost” or “phantom”. A guaranteed bill of rights by implication.Though penumbra is mainly associated with shadows and eclipses, it also has the following definitions: It is also defined as a sunspots’ gray area which surrounds the dark center. Regarding eclipses, it is the region of partial illumination. It is not a true shadow as it is only a gradient of the umbra. He utilized the word to aptly describe the blurry shadow surrounding an eclipse. “Penumbra” was coined by a German astronomer and mathematician, Johannes Kepler in 1604. As “umbra” translates to “shadow”, the penumbra is the lighter part which “hangs on the shadow” or that which is “almost a shadow”. Another Latin origin is “paene” which means “almost”. “Pen” is derived from the Latin word “pendere” which means “to hang”. The following discussions further delve into their distinctions. For instance, a lunar eclipse occurs when the moon passes through the earth’s umbra. They are often associated with astronomy specially when it comes to eclipses. Basically, the umbra is the darkest area while the penumbra is the lighter region which is found at the perimeter. “Penumbra” and “umbra” are terms pertaining to the parts of shadows.
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