. >> it goes way back to the ancient chinese, unscom of babylonians, they knew how because lerner and solar repeat themselves after a period of 18 years the eclipse will come back but in that one-third of the day it has repeated a 1/3 wave around the planet so what is coming up in august i saw that see the eclipse in munich 1989 it is part of the same series although a different part of the earth with the path of totality is the same as across the united states so they have figured out that cycle so they knew he probably would put on either side of the planet they didn't understand why they figured w out the pattern not really until the 18th century that scientist could mask the path of totality or that a leader clips would come on case certain date but that path was a detailed understanding but that did not come along and tell a few centuries ago. >> i work at st. joseph hospital was happy that you mentioned that little nugget of the sisters to that expedition we could not find a lot of information unfortunately but i was happy to see that. >> face to meet you. we have conversed by e