I think this guy should see a doctor. I don't even.
"In modern terms, the shadow lengths and time slice of the morning
study would be limited by the dimensions of the "2 kus sag" chart. The
midmorning shadow would at tangent angle of atan (assumed
gmonon/shadow), atan (1 cubit/1 cubit), atan (1/1), 45 degrees. The
understanding is that the texts define midmorning by a constant shadow
length of 1 cubit, not using time. The time (after sunrise) that the
sun reaches the midmorning locus varies throughout the year. At
Babylon, the noon shadow from a 1 cubit gnomon varies from 9/60 to
88/60 cubits over the year. The tangent angle at noon would range from
atan(1/(9/60)) to atan (1/(88/60)) , 48 to 33.86 degrees in modern
terms. Assuming full scale drawing on the shadows, the 2 kus on a side
would limit the "2 kus sag" chart to a certain window of shadow sizes
and tangent angles. The tangent angles in the 2 kus window would be
limited to atan(1/2), above 26.5 degrees. An alternate possibility is
to subtract 1 cubit from the "morning lengths", which some of the
gnomon instructions imply, and the resultant limit would be
atan(1/(1+2), atan(1/3), above 18.4 degrees."