<p>With Mars' thinner atmosphere I'm assuming twilight would not last as long compared to the duration on Earth.  Has there been any determination of the length of twilight on Mars at the equator or any other latitude?</p>

CC BY-SA 4.0
2019-12-23T21:42:48.300Z
Twilight at Earth’s equator is so brief as to be almost non-existent at each equinox, and very modest on the two longest days (the solstices). You only get a “real” summer twilight well away from the tropics, and it lasts the whole “night” around the summer solstice above about the 60th latitude.
Chappo Hasn't Forgotten
CC BY-SA 4.0
2019-12-23T23:29:28.930Z
@ChappoSaysReinstateMonica I don't understand the "almost non-existent" part of your statement. The website timeanddate.com indicates today, December 23, in Belém, Brazil there will be a total of 2 hours and 31 minutes of morning and evening twilight, and only a few minutes less on September 23. https://www.timeanddate.com/sun/brazil/belem.  What do you mean by a "real" summer twilight?
Bob516
CC BY-SA 4.0
2019-12-26T22:35:33.063Z
Yes, I was a bit loose with my terms, I was thinking how quick *civil twilight* is at equator vs higher latitudes. On Dec 22 the Sun set at Belém at 18:18, civil twilight ended at 18:41 (23 mins), nautical twilight at 19:07 (26 mins) and astronomical twilight at 19:33 (26 mins). Compare with Ushuaia (54°48′ S): sunset 22:11, civil twilight ends 23:09 (58 mins), and not entering astronomical twilight at all (i.e. twilight lasts all "night").
Chappo Hasn't Forgotten
<mars><twilight>
At Mars' equator how long does twilight last?
Bob516
# At Mars' equator how long does twilight last?

(Asked by: username_0 on 2019-12-20)

With Mars' thinner atmosphere I'm assuming twilight would not last as long compared to the duration on Earth. Has there been any determination of the length of twilight on Mars at the equator or any other latitude?

**Tags:** mars, twilight

> **Comments:**
> **username_1**: Twilight at Earth’s equator is so brief as to be almost non-existent at each equinox, and very modest on the two longest days (the solstices). You only get a “real” summer twilight well away from the tropics, and it lasts the whole “night” around the summer solstice above about the 60th latitude.  
> **username_0**: @ChappoSaysReinstateMonica I don't understand the "almost non-existent" part of your statement. The website timeanddate.com indicates today, December 23, in Belém, Brazil there will be a total of 2 hours and 31 minutes of morning and evening twilight, and only a few minutes less on September 23. https://www.timeanddate.com/sun/brazil/belem.  What do you mean by a "real" summer twilight?  
> **username_1**: Yes, I was a bit loose with my terms, I was thinking how quick *civil twilight* is at equator vs higher latitudes. On Dec 22 the Sun set at Belém at 18:18, civil twilight ended at 18:41 (23 mins), nautical twilight at 19:07 (26 mins) and astronomical twilight at 19:33 (26 mins). Compare with Ushuaia (54°48′ S): sunset 22:11, civil twilight ends 23:09 (58 mins), and not entering astronomical twilight at all (i.e. twilight lasts all "night").  

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