This is indeed very interesting.
So using Snell's law (which I am not very familiar with) are you saying that using the original and center to center angles of 43.33 and 31.95 the correct solution does indeed give us air to water (frozen) since it is supposed to be minus 40 degrees Celsius and thus we have air to ice ?
A most unexpected result and adding a bit more "proof" to my theory on the elements being shown here at Giza.
As always thank you very much.
PS: What would the value be if we use a temperature of minus 40 degrees Celsius. Does this change it for the speed in Air ? Does this help the result get closer to 1.3049 to 1.3147