How are sunrise, sunset, moon rise and moonset defined?
Looking at various websites that cite sunrise and set times had me wondering what is the official definition of"sun rise" or "sun set" etc??? (Likewise for the moon)
Is it defined by assuming you are on a flat plane with unobstructed horizon?
Does the full disc have to be above the horizon to be "risen" or only part of the disc??
I was hoping a met guy or savvy pilot may have the answer.
This question in no way indicates I have too much time on my hands...honest