gnomon height: 23 mm

  time    distance
0700/1700  85.8 mm
0730/1630  55.5 mm
0800/1600  39.8 mm
0830/1530  30.0 mm
0900/1500  23.0 mm
0930/1430  17.6 mm
1000/1400  13.3 mm
1030/1330  9.5 mm
1100/1300  6.2 mm
1130/1230  3.0 mm
1200/1200  0.0 mm