One thing you can say about this time of year, the shadow’s westward movement certainly makes up for its feeble attempts to head back south. The graph plot hugely exaggerates the actual east-west movement, but using the Royal Exchange as a marker, there’s no denying the shadow’s heading west pretty quickly.
After a few cloudy days this counts as another lucky shot, with the east of the city under deep dark shadow there. But unlike the last, this day cleared up and I actually left the flat for a very cold walk along the river at Wapping in fast-fading orange light. It stayed clear and bitter all evening and that night the pond froze. A good time to rely on webcams.
Shard Analemma 