Sorry Dave I should have mentioned that declination is measured in degrees .
This is the wiki page http://en.wikipedia.org/wiki/Declination .
Nothing wrong with street view if the site is close to the road but if it isn’t then it is a bit more long winded , the site I linked to could help a lot with speeding up the process of the calc .
Not sure what you meant by “curve” , angle of rise perhaps ? If so yes . It varies depending on latitude i.e. in the Yemen the sun rises and sets much more steeply than here in the UK at the equator it’s straight up and down
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