penumbra
pronunciation
How to pronounce penumbra in British English:
UK [pəˈnʌmbrə]
How to pronounce penumbra in American English:
US [pɪˈnʌmbrə]
-
- Noun:
- a fringe region of partial shadow around an umbra
Word Origin
- penumbra
- penumbra: see umbrage
- penumbra (n.)
- 1660s, from Modern Latin penumbra "partial shadow outside the complete shadow of an eclipse," coined 1604 by Kepler from Latin pæne "almost" + umbra "shadow" (see umbrage). Related: Penumbral.
Example
- 1. Fortunately , at my location near athens , greece , I enjoyed pristine transparency ( ideal viewing conditions ) for this eclipse , where 40 percent of the lunar disk entered the penumbra .
- 2. Conclusion hsp70 was sensitive marker of ischemic damage , the anatomic distribution of hsp70 expression could be thought as ischemic penumbra .
- 3. However , as the entire moon will cross the penumbra partial shadow of the earth , it will appear significantly dimmer around the time of partial eclipse .
- 4. The next eclipse of the sun will occur late on june 1 , when the path of the moon 's outer shadow , or penumbra , will cross alaska , northern canada , siberia , and northern china .
- 5. Note that the " pre-p1 " image was taken four minutes prior to the predicted first contact of the moon with the penumbra .