Great video about langitude - it should be in the first post as more info!
Q1: How do we know on which hemisphere we are?
Q2: Where did you get that 20
LHA for longitude??
I just dont get it, there's no explanation, just open excel, there is 20 LHA.. i mean what?
It seems to me like i have to watch sun vertical angle periodically and when i find its on zenit, get the time..
Then somehow calculate longitude by substituing difference of sun zenit time from GMT noon and dividing somehow, but its not described here..
I dont want to use some scripted xls, i want to know how can i get LHA.