The December solstice happens at the same instant for everyone, everywhere on Earth – and this year the solstice occurs tomorrow, on Thursday December 21st at 16:28 GMT. The winter solstice happens every year when the Sun reaches its most southerly declination of -23.5 degrees. In other words, it is when the North Pole is tilted farthest away from the Sun, delivering the fewest hours of sunlight of the year. The Sun is directly overhead of the Tropic of Capricorn in the Southern Hemisphere during the December solstice and is closer to the horizon than at any other time in the year, meaning shorter...