What context can I use each word in?
Learn when and how to use these words with these examples!
umbra
Example
The moon's umbra is responsible for the total darkness during a solar eclipse. [umbra: noun]
Example
The photographer captured the umbra of the tree in his picture. [umbra: noun]
penumbra
Example
The penumbra of the shadow was not as dark as the umbra. [penumbra: noun]
Example
The penumbra of the eclipse was visible from our location. [penumbra: noun]
Good things to know
Which word is more common?
Umbra and penumbra are both technical terms used in science and astronomy. However, umbra is more commonly used in scientific contexts, while penumbra can be used in both scientific and non-scientific contexts.
What’s the difference in the tone of formality between umbra and penumbra?
Both umbra and penumbra are formal words that are typically used in technical or scientific contexts.
