The "wobble" referred to is called the "Saros Cycle", and is mainly used to predict Lunar and Solar eclipses. This natural cycle was known by different names under the Chaldean (neo-Babylonian) astronomers in the last several centuries B.C. One saros period after an eclipse, the Sun, Earth, and Moon return to approximately the same relative geometry, a near straight line, and a nearly identical eclipse will occur, in what is referred to as an eclipse cycle. A sar is one half of a saros.
The period of this cycle is about 18.03011700 years of 365.2421875 days each.
The combination of the Sun's and the Moon's gravitation pulls, which cause tides in the first place, and climate change are the reasons behind the expected flooding. Low-lying areas near sea level are increasingly at risk and suffering due to the increased flooding, and it will only get worse -- some floods could happen in clusters; meaning the flooding may last over a month. Depending on the position of the Moon, Sun and Earth, some cities may experience flooding on consecutive days or every second day.
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