Time and tide (and astronomical events) wait for no man, hence the early morning meet.
Soltice meets are arranged to co-incide with the actual astronomical time which varies year on year.
This meet is arranged to co-incide with the 2025 Vernal equinox which occurs at 0901 GMT.
At this time the sun appears to cross the equator and signifies the first day of spring in the northern hemisphere.
You may enjoy a walk around the nature reserve to see if you can spot any signs that spring has arrived.
Note that there has been snow in Sussex in March and Easter in some years!!