1. The problem statement, all variables and given/known data how can i calculate a co-ordinate on an ever increasing sized globe, where i do not know the circumference or diameter. the only constants i am aware of are my starting point, pi and how far i wish to travel. i figure that if time is an ever expanding globe, and not linear, then travel would be theoretically easier than forward or back, but across the diameter. but i cant seem to figure how to plot an exact point. now is a contant to me. where i want to go, (100 years in the future say) would also be a constant in relation to now. and i suppose i need 3 points as co-ordinates. 2. Relevant equations 3. The attempt at a solution perplexed.