11. Also note that the synodic month is actually a bit over 29 & frac12; days; it's more like 29.53. 12. It turns with a modelled rotational period of 29.53 days; the modern value for the synodic month is 29.530589 days. 13. The Octon is of a Metonic cycle ( 47 synodic months , 3.8 years ), and it recurs about 20 to 25 cycles. 14. It includes 111.5 synodic months, or 111 synodic months plus one this chart " ( each row is one sar apart ). 15. Glyphs in 51 of the 223 synodic month cells of the dial specify the occurrence of 38 lunar and 27 solar eclipses. 16. The schematic model that eventually was accepted is the Metonic cycle which equates 19 ( tropical ) years to 235 synodic months . 17. It includes 111.5 synodic months , or 111 synodic months plus one this chart " ( each row is one sar apart ). 18. Although there are many stories to interpret the intercalation, a period of 22 or 23 days is always 3 / 4 synodic month . 19. Thirty lunar days form one lunar or synodic month ( " tshes zla " ), the period from new moon to new moon. 20. The months of the Gregorian calendar are all very close to the 29.5306-day period of the moon's phases : the synodic month , or lunation.
