We have a limited number of lunations
, a measured amount of Moons in our lives.
In an email of January 15, 2015, he writes, "Interesting but not probative is the fact that this text was a lunation
, and lunations
frequently precede or follow copies of the Somniale in MS.
In the 1930s there was still a lot of original lunar work that could be done: one member of the Circle would circulate a chart of a lunar crater, such as Newton or Schickard, or some feature near the less well-mapped limb areas, (23) and the others would copy the chart and add to it at succeeding lunations
The moon referred to is not the real moon of the heavens, but a hypothetical moon on whose 'full' the date of Easter depends, and the lunations
of this 'calendar' moon consist of 29 and 30 days alternately, with certain modifications to make the date of its full agree as nearly as possible with that of the real moon, which is known as the Paschal Full Moon.
More accurately, the system has a period of 70 499 183 lunations
which is about 5 700 000 years: more details are at astro.
Similarly according to #2, we find that 235 lunations
consist of 235 x 29.
In my view, the Jewish calendar preserves the possibility of connecting to the wild rhythms of nature via the observance of the new moons and the annual holidays that are determined by the lunations
and the agricultural seasons of the earth: this is also a means of "surpassing civilization," (22) not by escaping from the world into the tame time of the Sabbath, but by embracing the wild rhythms of nature repressed by our clock driven culture.
The lunar month, or synodic cycle, continues to be the rough unit of measurement for the traditional Torres 'calendar', which is divided into eleven (possibly twelve) such lunations
The 19-year cycle, the so-called "Metonic Cycle", was chosen because 235 lunations
occur almost exactly in 19 mean solar years, and this is in step with the Julian calendar (Greulich 1979).
This maintained the real length of the year at 365 and a quarter days, while accommodating a lunar year in which twelve lunations
would cover only 354 days.
If you follow librations for a few lunations
you'll notice that the librated limb migrates all the way around the edge of the Moon each month.
During the March-April lunations
of 2009 I had noticed earthshine appeared quite prominent on a number of occasions.