Solstices and Equinoxs are exact astrological times, not as the psuedodruids at Avebury like to celebrate, each weekend either side of the event if it falls midweek.
Yep! been following the sun for a few years now and sol's and eq's are more often as not ,not on the 21st ,only come across druids(ha) once at the aforementioned Avebury ,I steer clear whenever I can