Thoh:
he woke up at.....
9:53am
...the angle the shadow makes with the ground is inverse tan (21/13)
...assuming the sun is really really far away, thats the same angle as the one from the bottom of the tree to the sun as it rides the big semicircle in the sky ...the time is 6am + [inverse tan (21/13)]/pi x 12hrs
Thoh joins the ranks of super hero's.

BTW did we ever meet in Chicago?
Therefore: (21/13) = 58.24 degrees.
Using direct proportions, change the angle into hours and minutes:
58.24 / 180 = x hours / 12 hours => x = 3.88 hours.
.88 hours / 1 hour = y minutes / 60 minutes => y = 52.8 minutes.
So the answer is 6:00 AM + 3 hours + 53 minutes, or 9:53 AM.
The fact that Thoh has a tan, reminds me of:
An Australian killer bug of negligible dimensions starts at the origin (0,0) of the standard two-dimensional rectangular coordinate system. The bug walks one unit right, then one-half unit up, then 1/4 unit left, then 1/8 unit down, etc.
In each move, it always turns counter-clockwise at a 90 degree angle and goes half the distance it went on the previous move.
Which point (x,y) in the x,y plane is the bug approaching in its spiralling journey
No Dingo's were hurt in the making of this question.