At sunset (of course).
The wallpaper version is available at the preceding link.
Today's Gratitude Item: DVD's on "Space" that magically appeared from a colleague's drawer. Long story short, my "Space" unit is laptop based. My students have to give in their laptops on Friday but we only finish classes the following Wednesday. That's where the DVD's come in! Needless to say I am unimpressed by the need for student laptops to be handed in so early - especially as we were not warned well in advance that this would happen and are expected to continue with "meaningful learning" until our very last session.