Some of you have noticed that those tiny numbers on the Map panels do not represent altitudes but rather indicate the date when that part of the panel was painted or collaged. Those Map dates correspond to "our" years, and I keep a list of equivalent dates. Currently there are about 85 Map years to each of our calendar years.
In the early years of my Map-making the years were determined by the rate of increase in the Map population. A one percent increase in population was equal to one Map year. You may see some tiny hand-written dates on the early panels.
In recent times that system became too tedious to maintain. Also, because I can now print sheets of clear labels with computer generated numbers the number of date labels per Map year has become arbitrary. We are currently in Map year 1050.