Earth, Moon, Sun motions

A bit OT but there are probably tides on at least one other moon

Concerning tide prediction on the earth. There is an observable cycle in the
tides of 723 days or 7 days less than 2 years.
The 2 principal harmonic sinusoidal components constituting tidal movements
are 12 hour (half day, S2) and 12.42060122 half lunar day cycle (M2). That
0.42060122 (about 25 minutes) remained, principally gives the tidal advance
of each tide.
A near common multiple of 12 and 12.42060122 is 723 solar days (1397.033822
M2 periods).
Which is 0.42009 hours more than 1397 M2 cycles so also about 25 minutes
outside of complete coincidence.

For predicted tides (extremely close to actuality, accounting for weather
effects) for one port over 12 years, for the same minimum low tide over this
723 day cycle are within +/-7 minutes of 06:03, each time, GMT

1985 , 17 Sept, at 05:59
1987 ,10 Sept, 05:59
1989 , 05 Sept, 05:58
1991, 27 Aug 05:24 and joint minimum low on 28 Aug at 05:56 (also an evening
low on 27 Aug )
1993 , 20 Aug, 05:59
1995 , 13 Aug , 06:04
1997 , 06 Aug , 06:09

But there are leap days in 1988,1992 and 1996 and there is the 1991 anomaly
Could anyone explain the last two observations. I suspect that the real year
is about 365.25 days, is something to do with it.

1989 , 05 Sept,
should read
1989, 03 Sept,

On Oct 15, 12:39*pm, "N Cook" <[Registered users can see links. ]> wrote:

All predictions are based on Ra/Dec derived from the Equatorial
Coordinate system which was made popular in the late 17th century as
more accurate clocks and telescopes took center stage in
astronomy.The modified system can be traced to John Flamsteed -

[Registered users can see links. ]

The problem with this highly destructive system,at least for
everything but predicting tides,celestial events,etc,is that it is not
based on 365 days 5 hours 49 minutes (365.25 days) but on the
calendrical system of 365/366 days.They came very close to spotting
the observational anomalies this system produces when looking at the
motions of Neptune but shunted these calendrically generated anomalies
into 'perturbation theory' rather than look in more detail at the
celestial sphere framework based around the 365/366 day system.

The mistake at the core of all this remains Flamsteed's false premise
and conclusion regarding daily rotation and the reasoning involving
daily rotational and annual orbital motions of the Earth,one that now
exists as an established 'fact' -

[Registered users can see links. ]

"... our clocks kept so good a correspondence with the Heavens that I
doubt it not but they would prove the revolutions of the Earth to be
isochronical... " John Flamsteed.


In short,there is nothing supporting the 'sidereal time' justification
for the Earth's daily rotation through 360 degrees and no person who
considers themselves an astronomer would believe daily rotation is
anywhere near 23 hours 56 minutes 04 seconds.Think of the growth of
concepts based on a flawed foundation like that and you have a
situation many times in magnitude worse than Piltdown man,in
fact,there are no known precedents for upholding a catastrophic
premise and conclusion based on attaching the daily rotation of the
Earth through 360 degrees to an external reference.

The so-called current financial crises is absolutely nothing compared
to what occurred in astronomy and related subjects and few have shown
the courage or the competence to face this urgent matter.

I've now tracked over 32 years and no obvious long term drift. Looks like 52
years would bring the 7 day adrift from bi-annual to process through 365
days

Only taking the tides that fall approximately 06:00 , not necessarily
coincident with minimum low, but close.

1971 , 04 Nov, 05:54
1973 , 29 oct, 05:51
1975 , 23 oct, 05:46
1977 , 15 oct, 05:48
1979 , 08 oct, 05:54
1981 , 01 oct, 06:02
1983 , 25 sep, 05:59
1985 , 17 Sep, 05:59
1987 , 10 Sep, 05:59
1989 , 03 Sep, 05:58
1991 , 28 Aug 05:56
1993 , 20 Aug, 05:59
1995 , 13 Aug, 06:04
1997 , 06 Aug, 06:09
1999 , 31 jul, 06:09
2001 , 23 jul, 06:10
2003 , 16 jul, 06:09

104 year cycle , not 52 year

As i could only google 1, presumably relevant tides reference to "723 day" ,
locked away , some more data, not complete archive, after that its
HMHO/Proudman or somewhere

so +/- 14 minutes of 06:00 over 74 years

1933, 14 mar , 05:47

1949 , 17 jan, 06:11
1951 , 10 jan, 06:13
1953 , 03 jan, 06:11
1955 , 31 dec, 05:50
1957 , 24 dec, 06:10
1959 , 18 dec, 05:55

1965 , 26 nov, 06:00

1969 , 11 nov, 05:56
1971 , 04 Nov, 05:54
1973 , 29 oct, 05:51
1975 , 23 oct, 05:46
1977 , 15 oct, 05:48
1979 , 08 oct, 05:54
1981 , 01 oct, 06:02
1983 , 25 sep, 05:59
1985 , 17 Sep, 05:59
1987 , 10 Sep, 05:59
1989 , 03 Sep, 05:58
1991 , 28 Aug 05:56
1993 , 20 Aug, 05:59
1995 , 13 Aug, 06:04
1997 , 06 Aug, 06:09
1999 , 31 jul, 06:09
2001 , 23 jul, 06:10
2003 , 16 jul, 06:09
2005 , 09 jul, 05:53
2007 , 03 jul, 06:05