<p>That argument seems correct.  A calculation by timeanddate.com would suggest that the day is about 9 seconds longer in <a href="https://www.timeanddate.com/sun/@55.751,49.124?month=9&amp;year=2021" rel="nofollow noreferrer">Kazan</a> than in <a href="https://www.timeanddate.com/sun/@55.751,37.619?month=9&amp;year=2021" rel="nofollow noreferrer">Moscow</a> on the 23rd of September, consistent with your prediction</p>

CC BY-SA 4.0
2021-07-22T09:03:10.587Z
2021-07-22T14:24:13.533Z
2021-07-22T14:24:13.533Z
James K
<p>I'm trying to solve this task:</p>
<blockquote>
<p>Moscow and Kazan are located on the same parallel. In which of them the length of the day is bigger on 23 of September?</p>
</blockquote>
<p>In Kazan the sun will rise earlier, because it's more on the East than Moscow and Earth spins to the East. The difference between the sunrise time is 46 minutes (I've calculated it from the difference of their longitude). My idea was that during these 46 minutes after rising in Kazan the Sun is going to move on the ecliptic a little, thus starting an astronomical autumn and because of that in Moscow the day should be a little shorter (by some seconds, but still).</p>
<p>Is this right? If not, could you please explain how to solve this? Thanks for any help.</p>

<the-sun><orbital-mechanics><equinox>
In which town is the length of the day bigger on 23 of September?
ALiCe P.
# In which town is the length of the day bigger on 23 of September?

(Asked by: username_0 on 2021-07-22)

I'm trying to solve this task:

> Moscow and Kazan are located on the same parallel. In which of them the length of the day is bigger on 23 of September?

In Kazan the sun will rise earlier, because it's more on the East than Moscow and Earth spins to the East. The difference between the sunrise time is 46 minutes (I've calculated it from the difference of their longitude). My idea was that during these 46 minutes after rising in Kazan the Sun is going to move on the ecliptic a little, thus starting an astronomical autumn and because of that in Moscow the day should be a little shorter (by some seconds, but still).

Is this right? If not, could you please explain how to solve this? Thanks for any help.

**Tags:** the-sun, orbital-mechanics, equinox


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## 1 answers

### Answer by username_1 on 2021-07-22. Score: 4 | Accepted answer

That argument seems correct. A calculation by timeanddate.com would suggest that the day is about 9 seconds longer in [Kazan](https://www.timeanddate.com/sun/@55.751,49.124?month=9&year=2021) than in [Moscow](https://www.timeanddate.com/sun/@55.751,37.619?month=9&year=2021) on the 23rd of September, consistent with your prediction


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