Geograph - photograph every grid square

Another in the series showing the weir at different states of the tide. Today is 48 minutes before high water, one day after the new moon with the weir gate raised.
For comparison this one J3474 : Dredging the River Lagan, Belfast - 2010/11 (41) (25 October 2010) shows the gate lowered, within a few minutes of high water, two days after the full moon.
This J3474 : The Lagan weir, Belfast (17) (15 May 2011) shows the gate raised, 18 minutes before low water, two days before the full moon.
The tide reaches its highest (and lowest) approximately two days after the full and new moons – an effect known as a “spring tide”.
I won’t even mention the relative distances of the Earth and the Moon!