"Dear tahw, what time and date is it over there? Please write back. I shall write again next month. Sincerely, phyzome"
...
"Dear tahw, over the past year, I have noticed something interesting in our correspondences -- more hours have passed on your end than mine, on average. I believe our clocks are ticking at different rate. Yours, phyzome"
(except measuring number of ticks, as communicated over fiber optics, and possibly with other tricks to cancel out communication lag)
...
"Dear tahw, over the past year, I have noticed something interesting in our correspondences -- more hours have passed on your end than mine, on average. I believe our clocks are ticking at different rate. Yours, phyzome"
(except measuring number of ticks, as communicated over fiber optics, and possibly with other tricks to cancel out communication lag)