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From my larping experience
Moon position, it's not as reproducible as the sun, but you can really see the moon moving through the sky.
Light, especially in summer, it starts to get night around 22, is pitch black at midnight around 3-4 you start to guess some light in the sky, at 5 it's not day yet but you can see without a torch, and at 6 it's bright.
Candle and fire-pit aren't objective clock, but still a way to evaluate how much time has passed.
It's funny you say candle, because there were actually fire clocks that were very accurate. They couldn't tell you what time it was, but they could tell you very accurately how long they had been burning. If lit before nightfall and timed with a sundial, they were capable of rather precisely telling what time it was at night.
Similarly, sand clocks have been a thing for thousands of years. Think hourglass, but with different size holes and made of different materials with larger volumes.
We think sand clocks have only been in use since the middle ages, and the reason they were invented is pretty interesting. (At least in Europe; I've looked into this before and couldn't find any other sources, but I may just not have looked hard enough).
For reasonably accurate time keeping, people had been using water clocks since at least the 16th century BCE. Basically the same idea as a sand clock, but water, which was slightly easier to feed into a reservoir. We don't think sand clocks really saw any use until the 13th or 14th century CE. Mostly, people needed to keep more accurate time on ships as oceanic voyages became more common, but the movement of the vessel messed up a water clock too badly to be useful, and pendulums had the same problem. So, enter a sand clock! Basically the same idea as a water clock, but way less prone to errors from the ship's movement.
(edit: some spelling)
Ooo, you touched on one of my favorite clock history tidbits, Maritime timekeeping. It is so fascinating. Like, the only reason spring-driven rotational oscillation mechanisms were invented was for maritime clocks. They were needed for accurate longitudinal calculations and really enabled the whole golden age of sailing. (yes, I am leaving out the Peloponnesian peoples, but they are a super awesome topic for another post)