My prior postings on this have been edited and consolidated at:
http://www.mtaonline.net/~hheffner/EarthWobble.pdf
including the remarks that follow.
Looking again at:
http://maia.usno.navy.mil/xplot1.gif
We have a beat frequency |F1 - F2| of about 1/(7 years) and summed
frequency of |F1 + F2| of about 1/(0.9 years). This gives frequencies:
F1 - F2 = 0.1429 y^-1
F1 + F2 = 1.1111 y^-1
2F1 = 1.2539 y^-1
F1 = 0.6270 y^-1
F2 = 0.4841 Y^-1
and the precession periods:
P1 = 1.585 y
P2 = 2.066 y
A hypothesis that might be checked out with further calculation is
that these are precession periods of nearby black holes that affect
the magnitude and direction of the ambient gravimagnetic field.
The speculation still is the Earth local gravimagnetic induction is
due to wild variations in Earth's ambient gravimagnetic field due to
the mutual torquing of two black holes in close proximity. Their
mutual orbital period is about 40 years, with wild variations in
orbital parameters and precession when in close proximity caused by
their powerful mutual gravimagnetic influences. An overall cycle of
191 years is due to departure of the black holes from close proximity
and thus the powerful mutual gravimagnetic influences, which are a 1/
r^3 effect. It looks like the black holes may have a mutually caused
precession rate of about 1.6 years and 2.1 years. It looks like
things are heating up between them, and a really big merger event is
not far off - within a millennium.
Gravimagnetic induction affects the Earth's rotation rate by changing
the amount of gravimagnetic flux through the earth. This is
analogous to changing magnetic flux through a conducting ring. The
induced current change in the ring is analogous to the change in mass
current of the earth, and thus the angular velocity of the Earth.
