Bill93 Posted November 11, 2017 Share Posted November 11, 2017 (edited) An interesting thread (and links) on the professional forum talks about Michelson's measurement of the speed of light in the 1920's and the assistance the US C&GS gave him. They ran a very long baseline to better accuracy than I can imagine, and triangulated to marks on two mountains. Michelson sent light from one to a mirror on the other and measured the round-trip travel time. https://rplstoday.com/community/threads/best-tool-for-calculating-distance-between-two-points-over-very-different-epochs.332509 Edited November 11, 2017 by Bill93 Chg link to beginning of thread Quote Link to comment
astrodanco Posted November 15, 2017 Share Posted November 15, 2017 (edited) And now thanks to men like Michelson if we want to know the distance we bounce a laser beam back and forth and measure the round trip travel time. Edited November 15, 2017 by astrodanco Quote Link to comment
Bill93 Posted November 28, 2017 Author Share Posted November 28, 2017 (edited) That site has changed so the link above no longer works. There are new and informative posts to the thread. See https://rplstoday.com/community/gnss-geodesy/best-tool-for-calculating-distance-between-two-points-over-very-different-epochs/paged/1/ Edited November 28, 2017 by Bill93 update Quote Link to comment
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