Slow the planet down... what? again?
You're too young to remember it but way back, about 50 years ago, near the beginning of the 21st century, we accidentally ripped hours out of each day, and nearly wrecked the planet doing it.
Back then we were trying to figure things out. We built this enormous machine in Switzerland, an enormous magnetic tunnel which looped back on itself to form an perfect circle. We used it to smash atoms together at speeds just shy of the speed of light. Then we studied the collisions to learn what those atoms were made of. We were looking for one particular part called a boson. That was the part which hooked each atom into the underlying fabric of reality, giving the atom weight and mass. We weren't sure it really existed or that reality was really like a fabric, but we kept searching; enhancing the machine with each successive experiment.
It was only a matter of time, till we found one. It was on the 9th of May in 2015, and nobody who survived will ever forget that day. For what nobody had expected, was that first liberated boson might lodge itself in the space-time fabric, creating a fixed motionless point in all three dimensions.
Up until then, everything in the universe had been sliding along the frictionless fabric of reality, spinning around themselves and each other in beautifully interrelated orbits. Then, for one fraction of one millisecond, a fraction of one swedish atom got stuck, and the entire mass and momentum of the planet pivoted violently around that point.
The boson disintegrated under the strain, charring a third of the planet as it unbecame. It happened in the nick of time. If that little particle had lasted any longer, we would probably have lost our orbital momentum. The perfect balance of speed and weight, which keeps us from falling into the sun, was barely preserved.
The planet lost alot of its spin in that moment... and a lot of buildings, and cars, and people, and just about everything else that wasn't strapped down. Its oceans washed over the mountains and down into the plains.
It was a cosmically bad day, and the last 24 hour day that our planet will ever know.
Now our light times are nearly a week long, but then again, so are our nights.