It’d moved even less far in 24 hours. The huge dark patches around the shadow point to this being a lucky shot, with the shadow tip just about visible just southeast of the Royal Exchange.
22 hours and three minutes after this shot was taken, it was the winter solstice, with the Sun lowest in the sky. And it was cloudy, so this will remain the longest shadow of the series, unless I’m still doing this one sunny solstice in the future. The winter solstice is cause for celebration, as after its long haul south the Sun finally starts heading north again, bringing more daylight and shorter shadows. But as the long flat bottom on the graph above shows, it certainly doesn’t change very quickly. Still, if I were building a huge henge, I’d align the megaliths for this day for sure.
Shard Analemma 