Hello,
I love the idea of your plugins! But it seems to not work every night.
Some nights are darker and the full moon isn't present every night. Is it normal?

Do you see any errors in console? That is definitely not normal.

No, I don't see any error in the console :/
How works your plugin? You "spawn" the full moon at midnight?

Could you post a list of plugins you have installed? You can use the code tags on here or https://pastebin.com

The plugin works by sending each player an environment sync message with a date that has a full moon. Every night will have a full moon.

I use:
Arkan
Deekay
Ember
FurnaceSplitter
ZoneManager
ZoneDomes
GUIAnnouncements
ImageLibrary
MagicPanel and extensions
MonumentProtection
MovableCCTV
NudistHeli
SAMSiteAuth
ServerArmour
SimpleKillFeed
SimpleSort
WelcomeUI
Others are my own plugins and no one is touching environnement, time, ...

Merged post

Is it possible that this happens because the moon is not always at the same location?
It could be because of that some nights are darker than other :/

What do you mean by the moon is not always at the same location? As soon as the moon appears it will be a full moon, it will move across the sky as a full moon and set as a full moon.

I dont't see any plugins you have installed that might cause a conflict. Try and load only ClearNight and see if it has odd behaviour. Run these commands and the moon will be at the top of the sky.

oxide.unload *
oxide.load ClearNight
env.time 0