On 2009.03.12, at 09:32 , Irv Bromberg wrote:
Anyhow, try this with my spreadsheet and automatic scaling switched on: For any leap cycle, choose a 20-year step size. You'll see wild monthly oscillations. (Some curves may be nearly smooth if they happen to be close to a multiple of the lunar cycle away from the middle year.) Change the step size to 19 years and update the chart, then the curves will all be quite smooth.
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.
-- Irv Bromberg, Toronto, Canada
