Starwatch How to enjoy the full eclipse experience on 21 August, during the first total solar eclipse to cross the USA from coast to coast since 1918
The countdown to the Great American Eclipse on 21 August is entering its final week as eclipse-watchers are completing their plans for the first total solar eclipse to cross the USA from coast to coast since 1918.
Millions live in the path of totality, the corridor up to 115km wide that visits 14 states from Oregon to South Carolina. Millions more will converge on it so that highways may be gridlocked and hopes of chasing clear weather may be curtailed. Even for those under clear skies, though, one has to wonder just how many will enjoy the full eclipse experience.
As I mentioned last month, it is only during totality that the Suns awe-inspiring corona and prominences might be glimpsed. And it is only during that brief window, no more than 2 minutes and 40 seconds long, that we may look at the Sun directly without serious damage to our eyes.
I have no doubt that some misguided souls will waste their few seconds of totality by fiddling with their phones and cameras as they struggle to take photos or even selfies while the resulting fusillade of camera flashes annoys those around them.
The eclipse experience includes the gradual partial eclipse phase, as the Moons disc takes more than an hour to encroach on the Sun. By the time 90% of the Sun is hidden, even for areas adjacent to the eclipse path, we can expect temperatures to drop, the daylight to take on an eerie hue and, possibly, wildlife to behave unusually.