Waldo Posted March 8, 2018 Share Posted March 8, 2018 does the earth turn with that accuracy, doubt it. The speed with which the Earth spins, changes! I'd be interested in what actually a second is. I imagine it's a 86400th of the average amount of time it takes the Earth to rotate? Which is totally not a precise thing! Link to comment Share on other sites More sharing options...
cgksheff Posted March 8, 2018 Share Posted March 8, 2018 "The decision to redefine the second was ultimately that of the International Committee of Weights and Measures, an organization that works to standardize and coordinate measurements. At its 13th official meeting in 1967, the committee adopted the following definition: "The second is the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom." " https://www.scientificamerican.com/article/how-does-one-arrive-at-th/ Link to comment Share on other sites More sharing options...
choogling Posted March 9, 2018 Author Share Posted March 9, 2018 "The decision to redefine the second was ultimately that of the International Committee of Weights and Measures, an organization that works to standardize and coordinate measurements. At its 13th official meeting in 1967, the committee adopted the following definition: "The second is the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom." " https://www.scientificamerican.com/article/how-does-one-arrive-at-th/ yes I thought it might be. Link to comment Share on other sites More sharing options...
Marsman Posted March 9, 2018 Share Posted March 9, 2018 The speed with which the Earth spins, changes! I'd be interested in what actually a second is. I imagine it's a 86400th of the average amount of time it takes the Earth to rotate? Which is totally not a precise thing! AFAIK the rotation of the Earth is slowing down mainly due to the effect of the moon. The Earth is slowing down and the moon is absorbing some of that energy and increasing its orbital distance from the Earth. Link to comment Share on other sites More sharing options...
truman Posted March 9, 2018 Share Posted March 9, 2018 The speed with which the Earth spins, changes! I'd be interested in what actually a second is. I imagine it's a 86400th of the average amount of time it takes the Earth to rotate? Which is totally not a precise thing! What..you mean like counting 1 mississippi,2 mississippi, 3 mississippi etc? Link to comment Share on other sites More sharing options...
cgksheff Posted March 9, 2018 Share Posted March 9, 2018 yes I thought it might be. It's a bit of a bugger when I've managed to count to 9,192,631,699 and phone rings!!!!! Link to comment Share on other sites More sharing options...
Jeffrey Shaw Posted March 13, 2018 Share Posted March 13, 2018 The speed with which the Earth spins, changes! I'd be interested in what actually a second is. I imagine it's a 86400th of the average amount of time it takes the Earth to rotate? Which is totally not a precise thing! Yes- hence the occasional Leap Second at the end of 30 June or 31 December [= seven pips!] Link to comment Share on other sites More sharing options...
Geo-atkinson Posted March 16, 2018 Share Posted March 16, 2018 Blimey! My clock at home is five minutes fast. But i've never missed a bus. Link to comment Share on other sites More sharing options...
RiffRaff Posted March 16, 2018 Share Posted March 16, 2018 What..you mean like counting 1 mississippi,2 mississippi, 3 mississippi etc? Exactly that. (Lucky ol' Leonard!) Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now