<p>I found some chart regarding this, which is here:</p>
<p><a href="http://www.mkrgeo-blog.com/remote-observation-of-the-total-lunar-eclipse/" rel="nofollow noreferrer">http://www.mkrgeo-blog.com/remote-observation-of-the-total-lunar-eclipse/</a></p>
<p>The light level drops from about 50-60% prenumbral phase. It becomes noticeable.</p>
<p><a href="https://i.sstatic.net/wQs0G.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/wQs0G.png" alt="enter image description here" /></a></p>
<p>If you want to get the percentage illumination of the Moon during the eclipse, install the <a href="https://www.ap-i.net/skychart/en/start" rel="nofollow noreferrer">Cartes du Ciel</a> and turn on the Earth's shadow. Then you will be able to gauge the percentage value.</p>
<p><a href="https://xjwfriends.com/2018/02/18/astronomical-diary-vat-4956/" rel="nofollow noreferrer">https://xjwfriends.com/2018/02/18/astronomical-diary-vat-4956/</a></p>
<p><a href="https://i.sstatic.net/pZZaI.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/pZZaI.png" alt="enter image description here" /></a></p>

CC BY-SA 4.0
2020-12-04T14:37:59.690Z
That's a plot of [sky brightness](https://books.google.com/books?id=F6XiW7vCGvAC&lpg=PA193&ots=NnpMM_gcBt&pg=PA193#v=onepage&q&f=false), not what was asked.
Mike G
CC BY-SA 4.0
2020-12-04T15:07:29.117Z
OK I will edit my answer
Geographos
CC BY-SA 4.0
2020-12-04T08:48:07.457Z
2020-12-04T15:10:23.563Z
2020-12-04T15:10:23.563Z
Geographos
<p>I am looking for the information on the percentage illumination of the moon during the different stages of a total lunar eclipse. Is there a database from where I can acquire information of lunar illumination, distance and angle for the July 27th 2018 lunar eclipse for a given location? </p>

CC BY-SA 4.0
2018-11-21T15:54:34.353Z
You mean the percent of the moon's surface which is illuminated fully by the sun?  Do you want to include the penumbra?  What do you mean by angle and distance?
Carl Witthoft
CC BY-SA 4.0
2018-11-22T09:42:26.320Z
Related: [What irradiance does the Moon receive during a total lunar eclipse?](https://astronomy.stackexchange.com/q/27569/7472)
Glorfindel
CC BY-SA 4.0
2020-12-04T18:36:16.417Z
Or, are you asking, for example, if the moon is 99.999999% illuminated at the start of the eclipse and 100.000000% at the middle?
Stuart Robbins
<the-moon><distances><lunar-eclipse><moon-phases>
Lunar illumination (percentage) data on an eclipse day needed
Baheerathan M
# Lunar illumination (percentage) data on an eclipse day needed

(Asked by: username_0 on 2018-11-21)

I am looking for the information on the percentage illumination of the moon during the different stages of a total lunar eclipse. Is there a database from where I can acquire information of lunar illumination, distance and angle for the July 27th 2018 lunar eclipse for a given location?

**Tags:** the-moon, distances, lunar-eclipse, moon-phases

> **Comments:**
> **username_1**: You mean the percent of the moon's surface which is illuminated fully by the sun?  Do you want to include the penumbra?  What do you mean by angle and distance?  
> **username_2**: Related: [What irradiance does the Moon receive during a total lunar eclipse?](https://astronomy.stackexchange.com/q/27569/7472)  
> **username_3**: Or, are you asking, for example, if the moon is 99.999999% illuminated at the start of the eclipse and 100.000000% at the middle?  

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## 1 answers

### Answer by username_4 on 2020-12-04. Score: 1

I found some chart regarding this, which is here:

<http://www.mkrgeo-blog.com/remote-observation-of-the-total-lunar-eclipse/>

The light level drops from about 50-60% prenumbral phase. It becomes noticeable.

[![enter image description here](https://i.sstatic.net/wQs0G.png)](https://i.sstatic.net/wQs0G.png)

If you want to get the percentage illumination of the Moon during the eclipse, install the [Cartes du Ciel](https://www.ap-i.net/skychart/en/start) and turn on the Earth's shadow. Then you will be able to gauge the percentage value.

<https://xjwfriends.com/2018/02/18/astronomical-diary-vat-4956/>

[![enter image description here](https://i.sstatic.net/pZZaI.png)](https://i.sstatic.net/pZZaI.png)

> **Comments:**
> **username_5**: That's a plot of [sky brightness](https://books.google.com/books?id=F6XiW7vCGvAC&lpg=PA193&ots=NnpMM_gcBt&pg=PA193#v=onepage&q&f=false), not what was asked.  
> **username_4**: OK I will edit my answer  

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