Originally posted by FabianFnas
If you mean a total eclipse and not only a ring-formed eclipse, you are absolutely right, there is a last eclipse coming, sooner or later.
But we are *not* in a very special time where it can happen - the very last true total eclips lies in the far future, long after man (as we know her) walks on the ground.
It is quite easy to calculate (with a ro ...[text shortened]... happen, with the aid of some trigonometry and the knowledge how fast moons orbital radius grows.
You are correct in that. It has to go out 14600 miles and it receeds at 3.8 Cm/Yr. That adds up to about the year 607 million CE. Here is one little trick I figured out, maybe you heard it first here! (Sometimes I get the feeling I never actually invent stuff but am just a good plucker out of the air of ideas already floating around)
Disclaimers aside, we all know about sundials or sunclocks.
Well knowing the date of the last total, you can see a continuum of
time and if you measure the size of the footprint you can see what year you are in if you happen to be a lost timetraveler. A simple land based Lunar clock. Going back in time from now, the footprint gets larger by a tiny amount per year so when it goes that when it is in 14600 miles the footprint will presumably be twice as large as it is now,
so that defines 600 million years in the past. That can work farther back in time than that, I imagine the first few total eclipses were whoppers in terms of footprint size.
So there you have it, a LUNAR clock. We'll see if anyone comes back with a rebuttal of my claim to this idea, no way of telling if other people though about it till they talk about it, eh!