East Coast Sea Kayaking Club

That's brilliant, thanks John. Very user friendly.

Will pencil those dates and see you there!

oceanservice.noaa.gov/education/tutorial_tides/tides06_variations.html
This is a link explaining how tides work and the relationship of Apogee and Perigee of the Moon and Aphelion and Perihelion of the Sun. I'm trying to see how these dates 2 Jan and 2 Jul fit into the tidal coefficient table but note that low lows and high highs happen two months later than expected on the TC table. Anyone an explanation.

At the equinoxes, the difference between spring and neap tides is larger. At the solstices, the difference between spring and neap tides is smaller.

The TC for the spring tide on Wed 22 Feb is 112. The TC for the neap tide a week later on Wed 1 Mar is 28. This is a difference of 84.

The TC for the spring tide on Mon 5 Jun is 87. The TC for the neap tide a week later on Mon 12 Jun is 57. This is a difference of 30.

This difference is because the distance between the earth and the sun is smallest at the equinoxes and largest at the solstices:



The angle of the moon to the earth also changes. This affects the tide too. The animation below illustrates this effect:

oceanservice.noaa.gov/education/tutorial_tides/tides04_angle.html

The apogee and perigee of the moon, and the aphelion and perihelion of the sun have an affect but they do not cause of the large spring tides at the equinoxes and the small spring tides at the solstices.

This is my understanding at least. Please correct me if I am wrong.

ntslf.org/about-tides/tides-faq
Para 12 is a help. Yes, it's quite complex when you look at equinoxes and Solstices then examine lunar and solar orbits with Apogee and Perigee and Aphelion and Perihelion dates. Then try to relate all these dates to tide charts and tidal coefficient tables. What a world we live in. Amazing.
Here's a link giving free tide charts for the year
www.visitmyharbour.com/tides/area/300/ireland