<p>I have a photograph taken with an infrared camera (scattered blue light filtered out) from within a medieval tower open to the sky. The stars ARE visible.</p>

CC BY-SA 4.0
2020-10-20T17:18:18.140Z
2020-10-20T17:18:18.140Z
Geoffrey Piltz
<p>No, because being in a deep well doesn't make the background dark.</p>

<p>The reason we can't see stars in the daytime is the atmosphere, which scatters sunlight in all directions such that along every sightline from the ground toward the sky you receive much more photons from the Sun than from a star.</p>

<p>That is, the photons that makes it impossible to see Vega, for instance, are the photons from the Sun that make their last scattering event at a molecule lying between you and Vega. Being in a well blocks the star- and sunlight from other directions, but lets through both star- and sunlight from Vega's direction.</p>

<p>Like this:</p>

<p><a href="https://i.sstatic.net/5lURG.png" rel="noreferrer"><img src="https://i.sstatic.net/5lURG.png" alt="well"></a></p>

CC BY-SA 3.0
2017-03-11T15:47:05.713Z
Venus is sometimes visible during the day, no well required: https://www.google.com/search?q=venus+in+the+day&ie=utf-8&oe=utf-8 Some report that Mars will show when it's at its brightest, but I've never seen it.
Wayfaring Stranger
CC BY-SA 3.0
2017-03-11T16:02:49.297Z
Some report that Venus is no star ;-)
pela
CC BY-SA 3.0
2017-03-11T08:40:49.223Z
2017-03-11T08:40:49.223Z
pela
<p>I am wondering whether it is possible for a guy in a deep well to see the stars in the daytime. </p>

<p>Now the background is dark. So might the stars be visible? </p>

CC BY-SA 3.0
2017-03-13T12:42:09.653Z
As the answer says, the sky  background still isn't dark.
Carl Witthoft
<amateur-observing>
Can someone in a deep well see the stars in daytime?
San
# Can someone in a deep well see the stars in daytime?

(Asked by: username_0 on 2017-03-11)

I am wondering whether it is possible for a guy in a deep well to see the stars in the daytime.

Now the background is dark. So might the stars be visible?

**Tags:** amateur-observing

> **Comments:**
> **username_1**: As the answer says, the sky  background still isn't dark.  

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## 2 answers

### Answer by username_3 on 2017-03-11. Score: 11 | Accepted answer

No, because being in a deep well doesn't make the background dark.

The reason we can't see stars in the daytime is the atmosphere, which scatters sunlight in all directions such that along every sightline from the ground toward the sky you receive much more photons from the Sun than from a star.

That is, the photons that makes it impossible to see Vega, for instance, are the photons from the Sun that make their last scattering event at a molecule lying between you and Vega. Being in a well blocks the star- and sunlight from other directions, but lets through both star- and sunlight from Vega's direction.

Like this:

[![well](https://i.sstatic.net/5lURG.png)](https://i.sstatic.net/5lURG.png)

> **Comments:**
> **username_4**: Venus is sometimes visible during the day, no well required: https://www.google.com/search?q=venus+in+the+day&ie=utf-8&oe=utf-8 Some report that Mars will show when it's at its brightest, but I've never seen it.  
> **username_3**: Some report that Venus is no star ;-)  

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### Answer by username_2 on 2020-10-20. Score: 0

I have a photograph taken with an infrared camera (scattered blue light filtered out) from within a medieval tower open to the sky. The stars ARE visible.


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