And the linked post reminded me of a question that arose while riding the train. At the time, I tried to communicate my question to some nice Tajik people (is that the right term for people from Tajikistan?) by literally drawing shapes in the dust on the Siberian prairie, since we didn’t have a common language.
Traveling from Vladivostok to Moscow takes you in the same direction as the sun from our perspective. Does that mean that there is a theoretical speed at which the train could’ve moved and at which the perceived time of day doesn’t pass*? If so, what constants and variables do I need to learn about in order to make the calculations? Earth’s rotation? The trains speed?
*while time of course passes on it’s own, in the sense that I am still approach my impending death in some decades.
The Sun’s apparent motion is 15° of longitude per hour. There are 94.3° of longitude between Vladivostok and Moscow, so you’d have to travel the distance in no less than 6 hours 17 minutes to keep up with the Sun. Assuming straight line flight not too far above the ground, that’s about 6400km (4000mi), so you’d need to be travelling around 1020km/h (about 640mph). Not quite supersonic, but you’re going to burn a lot of fuel.
The rail line that covers the distance is by no means a straight line though, so some sections with a large north or south component would need to be covered at a much, much higher rate of speed if you wanted the train to do it… and in fact the first stretch out of Vladivostok heads north-east so that part would be literally impossible to follow the Sun along unless you’re a time traveller.