Could Einstein have been aware of the Big Bang?
If so, he could have calculated the acoustic wave frequency of the Big Bang at the moment it happened, (Cosmologists think around 432 Megahertz) and then worked back to his time how long that sound wave would have stretched, causing it to lose its frequency...Lets say this was down 1Mhz to 431Megahertz...He could have calculated within that 1 Megahertz what would represent 1 billion years..1 million years..100,000 years..1000years..100years and so on down to a single day....Each of those periods of time would then represent a time slot within which he could precisely calculate the acoustic frequency (time period) that he wanted to go to and then use a separate acoustic wave to resonate with it, taking him back to that time period...