Across the US today, 21st August, Americans will huddle together in excitement looking up at the skies to watch as the moon entirely eclipses the sun. At about 5pm British time a shadow will begin to travel at 5,400 kilometres an hour across 14 American states. The journey from Oregon in the west to South Carolina in the east will last about 94 minutes. Each location in the path of the eclipse can expect about 2 and half minutes of darkness. Only those in the direct path will see “totality” which is when the sun is completely blotted out by the moon. But across the whole of North American and even some of South American a partial eclipse will be seen, enough for a noticeable change in light. Even the UK will see a very slight partial eclipse. But with our overcast and grey summer skies, we may not even notice. The UK can hope to have its own moment in the sun (or, rather in the shadow of it) in 2026.