The final diagram shows many different cycles superimposed on each other, highlighting areas where several cycles are coinciding.happy) mood has the graph line curving up then down like the mouth of a frown, and for the bad (unhappy) mood it curves down and then up, as in the mouth of a smile. Ironically, the section of the graph that shows a good (i.e. Lunar mood: The moon does not have a mood, although humans can have moods that fluctuate over time, sometimes with a regularity akin to a cycle.A shape intermediate between circle and square is known as a squircle, a subclass of the superellipse. Lunar shape: Again, this is a joke cycle the Moon does not actually change shape.There are also so-called supermoons, which occur when the full moon coincides with the Moon's closest approach to Earth these actually do increase the Moon's apparent size, although by a relatively insignificant amount. This may be playing on the idea that the Moon often appears to change size to viewers on Earth, due to various factors most commonly, this is due to the Moon illusion, which tricks the brain into perceiving the Moon as much larger than it really is. Earth-Moon relative size: This is a joke cycle the Earth and Moon do not physically change size, nor does the Moon ever become larger than the Earth.This is due to the fact that the Earth is also moving around the Sun while the phases are going on, which means that the Moon has to spend 2 extra days "catching up" to the point at which the lunar phase cycle can restart. Note that the synodic month is (perhaps counterintuitively) two days longer than the sidereal month - or to put it another way, it takes 2 more days for the Moon's phases to cycle than it does for the Moon to go around the Earth. This figure is referred to as the anomalistic month. This means that the moon's distance also follows a cycle which is the same as the length of one lunar orbit: approximately 27.5 days. Distance: Because the Moon's orbit around the Earth is elliptical, its distance from the Earth varies slightly over the course of an orbit.The cycle of lunar phases takes 29.5 days, a figure referred to as the synodic month. Phase: Lunar phase describes the change in shape of the sunlit side of the Moon as viewed from the Earth's surface, which is caused by the changing angle between Moon and Sun as the Moon revolves around the Earth.Apsidal precession is the gradual rotation of this line over time, which occurs in cycles of around 8.9 years for the Moon. These points are called apsides, and the imaginary line between them is called the line of apsides. Apsidal precession: All orbits have two points where the orbiting body is either closest to, or furthest away from, the thing they are orbiting.For the Moon this follows an 18.6 year cycle. Nodal precession is the gradual rotation of these nodes over time, a gyroscopic consequence of Earth's equatorial bulge. The two points at which these planes do cross are called lunar nodes. This tilt is why we don't constantly see eclipses most of the time, the Moon's orbital plane is tilted higher or lower than the Sun, so they generally don't cross each other. Nodal precession: The Moon's orbital plane is tilted slightly compared to the Earth's orbital plane around the sun (the ecliptic).The first four cycles are factual, while the ones following them are not. This comic shows a mixture of real, scientific lunar cycles and cycles that are comedic or fictional in nature. Title text: The Antikythera mechanism had a whole set of gears specifically to track the cyclic popularity of skinny jeans and low-rise waists.
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