A man-made light in the dark (methaporically) in which the dark is for example depression or just a sad period of time. You could be someone's neonetical moon, like how an artist can be one for you. An object could also be someone's neonetical moon, for example a stuffed animal.
Unprovoked crippling shooting arse pain you get every now and then (once in a 'blue moon') . Feels like someone is stabbing you in the arse hole for 10 seconds.