For some reason, this is the first time (after re-reading the trilogy I don't know how many times) that I noticed that. It made me wonder where (if we assume that this world is a twin of our own) on the planet that puts The Shire.
Googling "sunset September 22 2017 London" gives me a sunset of 6:53 pm, which might be Daylight Savings time, not sure. If it is, then the Standard time sunset would be 5:53, which means it would be dark enough by 6:30 for a fireworks show.
So, I gues no surprise, British times/seasons were on Tolkien's mind here.
Googling "sunset September 22 2017 London" gives me a sunset of 6:53 pm, which might be Daylight Savings time, not sure. If it is, then the Standard time sunset would be 5:53, which means it would be dark enough by 6:30 for a fireworks show.
So, I gues no surprise, British times/seasons were on Tolkien's mind here.