On 2009.03.12, at 14:33 , Irv Bromberg wrote:
Irv adds further: I just think this is really cool. Try other multiples of 19 in comparison with nearby rounded numbers, for example 38 with 40, 57 with 60, 95 with 100. Those that are multiples of 19 yield smooth lines, the others yield wavy lines.
I posted a new version of the "Find Calendar Seasons" spreadsheet that now calculates the mean synodic month in the era of the specified middle year, then calculates the continued fraction of the ratio of that synodic month to the leap cycle mean year, highlighting the optimal choices (>=19 and <500) in bold red-face text. For the present era the choices are 19 and 296 but in the remote past or distant future there may be useful alternatives. I also added more auto-scale settings.
-- Irv Bromberg, Toronto, Canada
