It’s the summer solstice today (June 21st), or the winter solstice if you’re in the Southern Hemisphere. Time to celebrate the life-affirming tilt of the North Pole by 23.5° towards the Sun, even though apparently summer solstice days are getting shorter – the longest one ever recorded was in 1912, which gave us an extra 4 milliseconds on top of our standard 24 hours. But don’t worry if you miss it completely – it’ll be solstice on Mars in a few days!