When is "day" and "night" considered to start?
I've tried searching for how those "hours" correspond in actual TIME, but because the terms are so common, I either get nothing useful, or just a repeat of statements like my example above... I realise this may be incredibly dumb
but it's frustrating me and until I can do a big load of book-buying and reading (probably New Year) I'm none the wiser - also, I found when I sit down to do a NAP incantation, they sometimes feel like they want to be done right away, sometimes earlier or I'll see a specific time in my head - which is making me think I should just try asking! 
Plz halp!
PS I wanted to add, I HAVE been reading a lot on here & elsewhere, so I'm not trying to be lazy
and a book recommendation that has that info in is equally welcome - the only reason I'm posting and not waiting until I can find out more is that I'm getting really STRONG prompts to do my NAP stuff at certain times, and yet GG-C doesn't mention that in his book. Also I'm getting weird phenomena coming through (wings audible/visible, and sundry other stuff) when I even read through the Enochian stuff posted in here, I guess because I've worked so much with invocation this past decade or so, so it's making research kinda hard! 
