So I found out, that there is a curfew every night in the City of Brass on the Elemental Plane of Fire. This makes me wonder: How does a day/night cycle work on the Elemental Plane of Fire? Is there a sun and if so, does it rise and set like a normal sun?
I'm looking for informations in any sourcebook of whatever edition of Dungeons & Dragons.
The source for the curfew is the book "Secrets of the Lamp" for 2nd edition published 1993. From page 27:
[...] a strict curfew is enforced each night