some went to northern arizona university, their telescope, and then others went to the us naval observatory, flagstaff station, located about four miles from here. so those three different groups using, those three different telescopes, the astronauts each looked through the telescope to see the moon and where they would be going. so in one day they could see what an actual impact crater looks like, how impact craters are depicted on maps and what they what moon's impact craters actually looked like. so the upshot that that first trip was very successful. nasa realized the value of training the astronauts to do geology and. all the future groups of astronauts who went to the moon came here to flagstaff to train. we're now out in the field where several miles from downtown flagstaff. not very far from sunset crater, which was a volcanic feature that erupted tens of thousands of years ago. so this entire field we're on our cinders from that explosion when the astronauts were training out here, they went to sunset crater and meteor crater and grand canyon and other places. but nasa's realized

so we now have machines that keep our time for us that i think most of them are set the naval observatory clock. so we got this nuclear clock that tries to keep exact time. and so we are as in sync time wise as at any point in human history. but what happens? the electricity goes out in the clock. stop. does time stop? then what we have to rely on we'd have to look around and kind of figure out and guess like, okay, sun's getting low, so. right, so electricity, the segment of time are things that we have been trained to accept. so one idea for us to contemplate is the role that historians play in understanding time. and so i'll throw out this notion that historians are people who have been trained in science and art of and we decide how much time we're looking at. we decide when something starts, when something ends. but how much of that is us imposing our vision on time right? so we're setting up those parameters so we can take a creek here and think, this creek has been flowing here. these drops of water have been rolling through here. they'll go up into the sky and come back down again