<p>Polaris is about 1 degree from the celestial North Pole. An image with sufficient magnification and sufficient exposure time will show a (short) trail for Polaris.</p>

<p>The difference between the images is the magnification and the exposure time and Magnification. The first image appears to have been about 10 hour exposure (actually a multiple exposure) The Last one appears to be 30 minutes or less. The first has also been magnified more than the last. The result is that the trail of Polaris is just too short to be visible in the last image.</p>

CC BY-SA 3.0
2018-04-12T07:23:16.700Z
2018-04-12T07:23:16.700Z
James K
<p>Does Polaris have a trail in the sky timelapse? Yes. Every star has a trail, but it's smaller if it's closer to the pole. <a href="https://en.wikipedia.org/wiki/Polaris" rel="noreferrer">Polaris</a> is close to the pole but it's still 45 (arc)minutes away. I don't think it's visible with the naked eye; <em>no</em> star trail is visible with the naked eye as you only see one 'instance' of the sky. What perhaps would work, and is more feasible for stars closer to the celestial equator, is trying to see the movement of a star compared to an object on Earth, e.g. a tree, a building or the horizon.</p>

<p>The exposure times of the photos are different, as @J.Chomel notes in the comments. You can calculate the exposure time by looking at the arc length; in 23 hours and 56 minutes (a <a href="https://en.wikipedia.org/wiki/Earth%27s_rotation#Stellar_and_sidereal_day" rel="noreferrer">'sidereal day'</a>), a star will make a full circle.</p>

<p>The trails on the last photo have an arc length of about 8 degrees, corresponding to about 30 minutes; the first two photos are more like 9 resp. 5 hours. Also, the zoom factor (of the lens) may play a role; if a photo is zoomed in more, Polaris' movement is more likely to be visible. I'm not sure if this plays a role in this photos, though.</p>

CC BY-SA 3.0
2018-04-12T07:14:59.663Z
2018-04-12T07:14:59.663Z
Glorfindel
<p>I came across few sources that claim Polaris movement cannot be observed with the naked eye. But then, I saw images of the star trails (timelapse), and they clearly show Polaris not quite at the true north and moving around the Earth's axis with a radius that is very visible. See for instance the following images:</p>

<p><a href="https://i.sstatic.net/PS1Wg.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/PS1Wg.jpg" alt="enter image description here"></a></p>

<p><a href="https://i.sstatic.net/f6X40.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/f6X40.jpg" alt="enter image description here"></a></p>

<p>However, this image from Wikipedia does not show a trail for Polaris:</p>

<p><a href="https://i.sstatic.net/ueFfM.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/ueFfM.jpg" alt="enter image description here"></a></p>

<p>What am I missing here?</p>

CC BY-SA 3.0
2018-04-12T06:49:21.023Z
The exposure time of pictures seem to be different.
J. Chomel
CC BY-SA 3.0
2018-04-12T17:23:50.973Z
FWIW Polaris is moving and at some future date ("you could look it up") it'll be well off geographic North.  In the meantime,  magnetic North is over 16 degrees off for us New Englanders.
Carl Witthoft
CC BY-SA 4.0
2018-05-05T17:54:26.863Z
Mhmhsh, your other question was deleted but you might find this interesting:    http://solar-center.stanford.edu/FAQ/Qsunasstar.html
userLTK
<amateur-observing><rotation><star-gazing><pole>
Does Polaris have a trail in the sky timelapse?
mhmhsh
# Does Polaris have a trail in the sky timelapse?

(Asked by: username_0 on 2018-04-12)

I came across few sources that claim Polaris movement cannot be observed with the naked eye. But then, I saw images of the star trails (timelapse), and they clearly show Polaris not quite at the true north and moving around the Earth's axis with a radius that is very visible. See for instance the following images:

[![enter image description here](https://i.sstatic.net/PS1Wg.jpg)](https://i.sstatic.net/PS1Wg.jpg)

[![enter image description here](https://i.sstatic.net/f6X40.jpg)](https://i.sstatic.net/f6X40.jpg)

However, this image from Wikipedia does not show a trail for Polaris:

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

What am I missing here?

**Tags:** amateur-observing, rotation, star-gazing, pole

> **Comments:**
> **username_1**: The exposure time of pictures seem to be different.  
> **username_2**: FWIW Polaris is moving and at some future date ("you could look it up") it'll be well off geographic North.  In the meantime,  magnetic North is over 16 degrees off for us New Englanders.  
> **username_3**: Mhmhsh, your other question was deleted but you might find this interesting:    http://solar-center.stanford.edu/FAQ/Qsunasstar.html  

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## 2 answers

### Answer by username_5 on 2018-04-12. Score: 5 | Accepted answer

Does Polaris have a trail in the sky timelapse? Yes. Every star has a trail, but it's smaller if it's closer to the pole. [Polaris](https://en.wikipedia.org/wiki/Polaris) is close to the pole but it's still 45 (arc)minutes away. I don't think it's visible with the naked eye; *no* star trail is visible with the naked eye as you only see one 'instance' of the sky. What perhaps would work, and is more feasible for stars closer to the celestial equator, is trying to see the movement of a star compared to an object on Earth, e.g. a tree, a building or the horizon.

The exposure times of the photos are different, as @J.Chomel notes in the comments. You can calculate the exposure time by looking at the arc length; in 23 hours and 56 minutes (a ['sidereal day'](https://en.wikipedia.org/wiki/Earth%27s_rotation#Stellar_and_sidereal_day)), a star will make a full circle.

The trails on the last photo have an arc length of about 8 degrees, corresponding to about 30 minutes; the first two photos are more like 9 resp. 5 hours. Also, the zoom factor (of the lens) may play a role; if a photo is zoomed in more, Polaris' movement is more likely to be visible. I'm not sure if this plays a role in this photos, though.


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### Answer by username_4 on 2018-04-12. Score: 3

Polaris is about 1 degree from the celestial North Pole. An image with sufficient magnification and sufficient exposure time will show a (short) trail for Polaris.

The difference between the images is the magnification and the exposure time and Magnification. The first image appears to have been about 10 hour exposure (actually a multiple exposure) The Last one appears to be 30 minutes or less. The first has also been magnified more than the last. The result is that the trail of Polaris is just too short to be visible in the last image.


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