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Old January 31st 18, 04:25 PM posted to uk.sci.astronomy
N_Cook
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Default Of moon and tides

On 31/01/2018 14:16, N_Cook wrote:
A quirk of celestial mechanics.
As the last blood-red , blue-moon, super-moon was 31 March 1866 we'll
have to wait 55458 days for the next coincidence of the tides in the
channel , presumably.
I wonder what conjuction of tidal harmonics gives a 55,458 day repeat.

The high tides in ports of a large part of the English channel today are
all the same time. I originally thought there was a problem with big-data
http://www.ntslf.org/storm-surges/la...ast?port=Dover
http://www.ntslf.org/storm-surges/la...?port=Newhaven
http://www.ntslf.org/storm-surges/la...ort=Portsmouth

And from the UK Hydrographic office, high tide times today
Portsmouth,10:53, 23:24
Newhaven, 10:43 , 23:17
Dover, 10:44, 23:09


Hydrographic Office EasyTide “predictions" for 31st March 1866…

Portsmouth times LW=04.40 HW=1129 LW=1658 HW=2353
Dover times Lw=0640 HW=1126 LW=1854 HW=2342

so once in a blood-red , blue-moon, super-moon

Now to find out any significance in
55458= 13x54x79
or in terms of 18.61 year or 8.85 year normal tide cycles