Help with shadow_info and SunRise

Juantxo

Hello,

I'm trying to debug this method but I could not find out why the same day has some seconds of difference in Sunrise.
May be it's not the right form to find out the Sunrise for a given time?
(I'm using Sketchup 8.04811)

Please help!


def fsun(year1,month1,day1,hours1, minuts1)
	model=Sketchup.active_model
	info=model.shadow_info
	
new_time=Time.local(year1, month1, day1, hours1, minuts1)
info["ShadowTime"]=new_time

	p(info["SunRise"])	
end


fsun(2011, 12, 21, 11, 59)
fsun(2011,  6, 21,  9, 59)
fsun(2011, 12, 21,  9, 59)
fsun(2011,  6, 21,  9, 59)
fsun(2011, 12, 21, 11, 59)


#RESULT;
# Wed Dec 21 08;24;22 +0100 2011 #SunRise should be equal?
# Tue Jun 21 06;37;23 +0200 2011
# Wed Dec 21 08;24;31 +0100 2011 #SunRise should be equal?
# Tue Jun 21 06;37;23 +0200 2011
# Wed Dec 21 08;24;22 +0100 2011
# true

TIG

It's probably just a minor tolerance issue.
If you can actually measure the sunrise to the nearest minute you'll be lucky!
The couple of seconds discrepancy are really nothing at all
The site's elevation and the relative height of adjacent landscape/buildings towards the rising sun direction will all affect the 'real' time much worse any, so why not be satisfied to the nearest minute or so ?
PS: 'SunRise_time_t' gives comparable results to 'SunRise' so that's not the issue

Juantxo

I thought I was doing something wrong.
Then, I don't worry about this discrepancy.

Thanks Tig