Can't help I'm afraid but do have a very Happy Christmas wherever you are. _, who is now 3, is already as manic as can be. Not sure how to burn off his energy...

(Dan) True. If you see the sun on the horizon it is geometrically just below it. It adds a few minutes to daylight at each end. It's refraction (strictly, differential refraction) not gravity-bending which would need a mind-bogglingly dense earth. On Venus the refraction is so large the horizon is above horizontal and it looks as if you're living in a bowl. A hot one, 460°C. No oxygen. Occasional showers of sulphuric acid.
(rab) See MCIOS, FUQs.

(Dan, Stevie) Nor the light in the boot of your car.

[rab] Isn't there a version of those ball-throwing arm extensions for dogs that you can get for kids? Alternatively, send him off to an aunt and uncle for the afternoon.
Merry Xmas, all.

Unfortunately the only aunt-uncle combo is based in NZ, so it'd be more than an afternoon...