Disclaimer - I’m not a trained physicist. I just have an interest in the subject so this question is probably going to come across really confusing but I’m trying my hardest to explain.
So firstly, this is my assumption of how time dilation works. So say, you travel in a spaceship at almost the speed of light for one day. You might only spend 1 day at that speed, but because time passes slower for you than people on Earth, so then that 1 day is actually 10 years in Earth time and when you might come back, everyone is 10 years older while you’ve only aged a day.
So given this, how would I achieve the opposite? How could I slow myself down in comparison to everyone else on Earth that me spending 10 years at that speed is actually only 1 day for everyone else?
I ask because there really isn’t an absolute velocity that everyone is travelling at right? We are stationary right now but the Earth is moving around the Sun which is moving around the Milky Way and who knows where that’s orbiting. How can I go slower than how fast I’m travelling currently?