Krypton Gas / Discussions

I couldn't see the answer in a search - apologies if this has already been covered. If I know that at the winter solstice the sun will be at an elevation of 20 degrees, my south facing (northern hemisphere) glazing is 4 metres high (bottom to top of windows) - then what is furthest point the sun will reach to into the...

Assuming the windows are appropriately facing south and the entire design is sound with thermal mass and good overhangs would double or triple glaze Argon filled windows be appropriate without the Low E coating?  The Low E coating does reduce the solar gain even if you choose a coating designed for the northern climate...