Not exact matches
Yes, either one could mark the year, but they are both unique events that imply the yearly
cycle of the sun
around the
moon.
Studies on animals with mating or migration patterns that revolve
around lunar
cycles could also illuminate the underlying biological drivers as well as the evolutionary benefit
of having a
moon - synced clock.
Coastal wading birds shape their lives
around the tides, and new research in The Auk: Ornithological Advances shows that different species respond differently to shifting patterns
of high and low water according to their size and daily schedules, even following prey
cycles tied to the phases
of the
moon.
The consensus is that several factors are important: atmospheric composition (the concentrations
of carbon dioxide, methane); changes in the Earth's orbit
around the Sun known as Milankovitch
cycles (and possibly the Sun's orbit
around the galaxy); the motion
of tectonic plates resulting in changes in the relative location and amount
of continental and oceanic crust on the Earth's surface, which could affect wind and ocean currents; variations in solar output; the orbital dynamics
of the Earth -
Moon system; and the impact
of relatively large meteorites, and volcanism including eruptions
of supervolcanoes.
The
Moon orbits
around the entire planet, Lunar
cycles are too intricate, they would be damn near impossible to replicate without any sort
of occasional mishap, even with the advanced technology.
The tidal range will change slightly each day due to local weather conditions and as the
cycle of the
moon moves
around the earth from neaps tides to spring tides.
Animals become humans under the watchful eye
of the
moon; humans become augmented creatures under the precise knife
of the surgeon, and love, death and rebirth
cycle constantly
around us.
They report a strong peak in both the AMO and the PDO data at
around 9.1 years and a weaker peak at about twice the period
of the strong peak, both
of which may be the result
of the lunar precession
cycle or the 18.6 year precession
of the nodes
of the
moon.
The fact that there were several solar
cycles of around that length in the later C20th might contribute to a misunderstanding, but Semi's Earth -
Moon barycentre AM graph seems to show it well enough, and velocity relates to AM as you know.