What's the name for the year when an extra day is added ? Is it an inter-calurary year - or is that something else ? That pushes the date of the solstice about.
Because the sun appears to stand still and to rise and set in very nearly the same place for five or six days a sensible person would suggest 'why get hung up on the exact time and place' ? It's just a process.
The days are getting longer now and the blackbirds, here, have noticed. In Washington state there is a minor heatwave and some of the Prunus trees are blooming.