Hi everyone. This probably isn't the right place for people like me to ask stuff like this but I've searched the internet and am finding it hard to get any answers so I thought I'd post here. If the measurement of time is something we do by counting predictable repetitions, and these can vary dependant on relative speed to other objects etc. etc., how can people make statements like, 'we know what happened 1 second after the Big Bang? Surely our measurements of one second has absolutely nothing to do with our universe at that point in 'time'. Thank you and I hope someone can explain this to me!