The Third Red Pill - Seasonal Peak Draconic Spring Tides

You will have to make an effort if you want to swallow Red Pill 3 

[Please click on the "RED PILL 1 & 2" links if you haven't read these red pills.]

RED PILL 1 The influence of cycles in the atmospheric lunar tides upon the Earth's atmospheric pressure can be re-inforced (i.e weaponized) if they constructively interfere with the annual seasonal cycle. 

RED PILL 2 If the lunisolar atmospheric tides that are associated with the Peak Seasonal Spring Tides play a role in influencing the Earth's atmospheric pressure, you should see variations in this pressure that occur at intervals of 3.8-year (= 1/5th the Metonic Cycle).

RED PILL 3 If the lunisolar atmospheric tides that are associated with the Peak Seasonal Draconic Spring Tides play a role in influencing the Earth's atmospheric pressure, you should see variations in this pressure that occur at intervals of 9.3-year (= 1/2th the 18.6-year precession cycle of the lunar line-of-nodes).

Remember:

There are four factors that can affect the strength of seasonal peak tides i.e. peaks in the lunisolar tides that align with the seasons:

1. The proximity of the Earth/Moon system to the Sun. 

2. The relative position of the Moon with respect to the Sun i.e. the Moon's phase. 

3. The proximity of a New/Full Moon to one of the nodes of the lunar orbit. 

4. The proximity of a New/Full Moon to the perigee/apogee of the lunar orbit. 

The red-pill 3 blog post will specifically deal with the factor that affects the strength of the Seasonal Peak Draconic Spring Tides i.e. factor 3.

GLOSSARY OF IMPORTANT TERMS

The draconic month = 27.212221 days. The time required for the Moon to move from one of the two nodes of its orbit back to the same node. 

The tropical year = 365.2421897 days. The length of the seasonal year.

The Proximity of the New/Full Moon to One of the Nodes of the Lunar Orbit

The Moon moves around the Earth in an elliptical orbit that is inclined to the Earth-Sun plane (i.e. the Ecliptic) by ~ 5.1 degrees. This means that the Moon crosses the ecliptic at two points known as the nodes of the lunar orbit. 

Hence, stronger than normal spring tides (known as draconic spring tides) occur whenever a New/Full Moon takes place near one of the nodes of the lunar orbit.

The Moon moves from one node back to the same node once every 27.212221 days. This period of time is called the Draconic lunar month. 

It turns out that 13 1/2 draconic months are 2.122791 days longer than one topical year. Hence, if a lunar node aligns with the Sun on a given day of the year, 6.410 years will pass before another lunar node aligns with the Sun on roughly the same day of the year. 

This is true because 6.410 years is the number of years it takes for, the 2.122791 days per year slippage between 13 1/2 draconic months and the tropical year, to accumulate to half a draconic month of 13.606110 days.

Unfortunately, when a lunar node realigns with the Sun on roughly the same day of the year, the Moon is no longer at the same lunar phase. In order to have a lunar node realign with the Sun on the same day of the year, and for the Moon to return to the same phase (e.g. New/Full Moon) as well, it would take a period of time set by the beat period between 3.796 and 6.410 years i.e. 9.308 years.

This means that if a New Moon takes place when one of the lunar nodes points at the Sun, 9.31 years later, a Full Moon will occur when a lunar node points at the Sun. Thus, the spacing between draconic spring tides is 9.31 years, a period equal to half of the 18.61336-year draconic lunar cycle. The latter is the time required for the lunar line-of-nodes to precess once around the Earth with respect to the stars). 

Technically speaking, draconic spring tides do not fall exactly on the same day of the annual seasonal cycle. However, they do take place within +5/-4 days either side of a given date (with an average absolute difference of only ~ 2.6 days), so they can be considered to be quasi-peak seasonal tides that take place on roughly the same day of the year, once every 9 or 10 years
The strongest of the seasonal draconic spring tidal events that occur at the times of total or partial solar and lunar eclipses. Hence, real-life evidence of the 9 or 10-year seasonal draconic spring tidal cycle can be seen in you list all total and partial lunar and solar eclipses that fall on or about a certain date. 

The following table lists all the 20th century total and partial lunar and solar eclipses that occur within +/- 6 days of the 21 st of September 00:00 UT.

Year____Day____Time from____Eclipse Type___Duration_____Lunar___Lunar____Spacing

_______________21 Sep 0 UT______________________________Phase___Node______from___
_______________dd:hr:min:sec___________________________________________Last Eclipse

1903___Sep 21___00:04:39:52___Total Solar_____2 m 12 sec____NM________________0 years

1912___Sep 26___05:11:45:_____Partial Lunar_____84 m_______FM___Ascending_____9 years
1913___Sep 15__-05:11:12:_____Total Lunar___232 m / 94 m__FM___Ascending___10 years

1922___Sep 21___00:04:40:31___Total Solar______5 m 59 s_____NM________________9 years

1931___Sep 26___05:19:48:_____Total Lunar____228 m / 84 m___FM___Ascending____9 years

1941___Sep 21___00:04:34:03___Total Solar_____3 m 22 s______NM_______________10 years

1950___Sep 26___05:04:17:_____Total Lunar____210 m / 46 m___FM___Ascending____9 years

1960___Sep 20__-01:01:04:_____Partial Solar_______0 m_______NM_______________10 years

1968___Sep 22___01:11:18:46___Total Solar_______40 sec______NM________________8 years

1978___Sep 16__-04:04:56:_____Total Lunar____208 m / 80 m___FM____Descending__10 years

1987___Sep 23___02:03:12:22__Annular Solar_____3 m 49 s_____NM________________9 years

1996___Sep 27___06:02:54:_____Total Lunar____204 m / 70 m___FM____Descending___9 years
1997___Sep 16__-04:05:13:_____Total Lunar___198 m / 62 m___FM___Descending___10 years

Average Spacing From Last Eclispse__________________________________________9.4 years


This shows that the average spacing between peak seasonal draconic spring tides is 9.4 years, which is close to 9.3 years (= half of the 18.6-year precession cycle of the lunar line-of-nodes).

Hence, if the lunisolar atmospheric tides that are associated with the Peak Seasonal Draconic Spring Tides play a role in influencing the Earth's atmospheric pressure, you should see variations in this pressure that occur at intervals of 9.3-year (= 1/2th the 18.6-year precession cycle of the lunar line-of-nodes).

References:

Wilson, I.R.G., Lunar Tides and the Long-Term Variation of the Peak Latitude Anomaly of the Summer Sub-Tropical High-Pressure Ridge over Eastern Australia, The Open Atmospheric Science Journal, 2012, 6, 49-60

http://benthamopen.com/ABSTRACT/TOASCJ-6-49