Hi Drew,

thanks for the response - elevation will indeed play a role. I don't know by how much though.

However, I would say that for a v1 possible obstacles (mountains, other houses, fence, ...) could be ignored and just imagined by the user. If they have a good idea of the arc through the sky then they can make a judgement themselves.

For me, the key to v1 is to not go too accurate in our algorithm by taking into account all variables. Aim would be to make it useful for those who just need an estimate.

Thanks,

Stijn.

PS: I will look at the site more closely tonight to see how they manage it. No time now.