An ASTUC thermometer is an alternative to arbitrary or scientific models of environmental measurement. The calibrating points are the temperature of fresh icewater and the body temperature of a healthy human being. These two temperatures can be determined easily by anyone and marked on a temperature mesuring device.
Using some basic geometry or another apropriate system the halfway mark is described on the thermometer scale. With a lineir scale a set of compases can be used to draw arcs between the two calibrating points. A line connecting the two points where the arcs cross is half way between the calibrating points.
This is the first mark of the ASTUC scale. The proceedure is repeated, succesively bisecting the distance between the two calibrating points until there are A38 degrees marked on the scale. The scale can be transcribed and copied to extend it beyond the two calibrating points and allowing you to measure temperatures below freezing and above body temperature.
The lower calibration point, the temperature of fresh icewater, is labeled 48 degrees A. The higher point is labeled 88 degrees A. "A" stands for ASTUC. Now the rest of the degrees are labeled using A Base. Any temperature below 48 degrees A is freezing. Room temperature is around the mid 70's and if your temperature is over 88 degrees A you should be taking better care of yourself.