<p>I know that the mean interval between total eclipses in a single place is about 375 years, which is not surprising given the small band of area of the totality. However, the penumbra of the eclipse partially shadows a much larger area than the totality:</p>

<p><a href="https://i.sstatic.net/DsFvB.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/DsFvB.png" alt="enter image description here"></a>
<em>Image Credit: NASA Scientific Visualization Studio</em></p>

<p>If we were to take a wider area, such as the band of 90% coverage, how many years would there be between eclipses at a single place on average?</p>

CC BY-SA 3.0
2018-03-05T10:34:13.957Z
Interesting question, and cool graphic! Where did that image come from by the way? It's usually good to cite the original source.
uhoh
CC BY-SA 3.0
2018-03-05T16:11:38.353Z
As a Q&D approach,  take the width of the totality band, divide by the width of the  90% band, and multiply 375 years by that ratio.  I'm not posting as an answer because it feels like too much of a hack.
Carl Witthoft
CC BY-SA 4.0
2021-03-10T14:44:13.547Z
Here some interesting links, but not (yet) an answer: https://eclipse.gsfc.nasa.gov/SEsaros/SEperiodicity.html and http://www.archaeocosmology.org/eng/eclipse.htm
B--rian
<solar-eclipse>
How often do partial solar eclipses of 90% of totality occur in same place?
Tyler Durden
# How often do partial solar eclipses of 90% of totality occur in same place?

(Asked by: username_0 on 2018-03-05)

I know that the mean interval between total eclipses in a single place is about 375 years, which is not surprising given the small band of area of the totality. However, the penumbra of the eclipse partially shadows a much larger area than the totality:

[![enter image description here](https://i.sstatic.net/DsFvB.png)](https://i.sstatic.net/DsFvB.png)
*Image Credit: NASA Scientific Visualization Studio*

If we were to take a wider area, such as the band of 90% coverage, how many years would there be between eclipses at a single place on average?

**Tags:** solar-eclipse

> **Comments:**
> **username_1**: Interesting question, and cool graphic! Where did that image come from by the way? It's usually good to cite the original source.  
> **username_2**: As a Q&D approach,  take the width of the totality band, divide by the width of the  90% band, and multiply 375 years by that ratio.  I'm not posting as an answer because it feels like too much of a hack.  
> **username_3**: Here some interesting links, but not (yet) an answer: https://eclipse.gsfc.nasa.gov/SEsaros/SEperiodicity.html and http://www.archaeocosmology.org/eng/eclipse.htm  

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