Changing the latitude to that of Easter Island ought to rearrange the pattern at least by increasing the number of days for winter and decreasing the number of days for summer. Certainly the Easter Islanders were aware of this fact.

A little detail had caught my attention: The Pokoman indians (who also counted with 20-day months) had a special term (cah-vinak) for 80 days. 'Winter' was, according to my arrangement of the Mayan months 80 + 5 + 80 = 165 days. Those Pokoman 80 days, I guessed, referred to the 80-day periods of 'winter'.

Increasing the number of 'winter' days should increase the 'cah-vinak' of Easter Island. The rongorongo writers would surely have chosen 84 'nights' instead of 80, I thought, increasing 'winter' by 8 nights and reducing the 'summer' days with the same number.

With 6 'winter' months (the Easter Island calendar had 12 months) instead of 8 and with 84 nights instead of 80 the result became 28-night months instead of 20-day months:

From this the length of the 6 (instead of 10) 'summer' months were easily calculated as necessarily being each 32 nights long: