I always use google maps, look outside your house at 3pm anyday, see which direction the shadows are falling, look on google mapd at your house, draw an imaginary line across your house/land which way the sun is shining/shadows falling.
Google map the ground and transfer the imaginary line in exactly the same direction as was falling on your house and you get a deadly accurate representation of where the sun is coming from so will be able to tell what the shadows will be like