More on rhythms

 I found some more stuff on rhythms.
 

Periodicity or wavelength	Inanimate world	Animate world
23 000 years	Milankovitch cycles (see the Wikipedia article)	Mass extinctions
54 years		Wheat prices
18 years		Real estate market
11 years	Sunspots and magnetic activity
3 years		Death from influenza (3 year pattern)
1 year	Seasons, caused by the Earth's orbit around the Sun	All plant growth (and indirectly all animals)
1 month	Moon’s orbit around the Earth	The menstrual cycle, emotional cycles
1 day	Rotation of the Earth around its axis	Sleeping and waking
2,5 hours		Average sleep cycle
3 minutes		Average length of a popular song (and of the thing that inspires so many popular songs)
20 seconds		Growth spurt of the crocus
8-9 seconds		Peristaltic movement in human digestion
6 seconds or so		Adult human respiration rate
every few seconds	Waves on the shore	Pylon driver
every second or less		Human heartbeat, human gait (walking, jogging running), pulsation of a jellyfish
More than once a second		Locomotion of smaller animals (snakes, inchworms, centipedes)
Up to 6000 rpms		Motor engines
		CPU clock speeds
Hz	radio waves
kiloHz – gigaHz	sound waves	singing, chirping, purring
teraHz and up	light waves and other types of radiotaion (X-rays etc.)

But there is still more to come, because the reason I started thinking about this was music, which is full of rhythms: you have the basic beat (which comes close to the human heartbeat, usually varying between 60 and 180 beats a minute), but on top of that, you have the rhythmic alternation of verse and refrain (most of which are a multiple of 8, in 4/4 music), and the less regular alternation between tension and relaxation ... 

More to come!