2 ms·

> by about 50 nanoradians for every meter you move vertically in the lab. Holy moly. Just what kind of measurements are you doing in your lab?

• ISL 7y ago
  Precision tests of gravity: https://www.npl.washington.edu/eotwash/node/1 https://www.npl.washington.edu/eotwash/node/1 Our most-recent measurement: https://news.ycombinator.com/item?id=22797729 https://news.ycombinator.com/item?id=22797729 Once you know how, it's not as hard as you'd expect to measure a nanoradian ;).
  • jpmattia 7y ago
    That looks like all kinds of fun! Thanks for the links.
    • ISL 7y ago
      It is fun -- it requires an interesting blend of patience and impatience. Each individual step in the measurement process is slow, but those who are most successful at it are very hungry to get at reliable answers quickly. Gravity is, by most measures, our oldest force, and while GR is a very successful theory, we know essentially nothing about the underlying mechanism. This is very much unlike the rest of the Standard Model, where we have very-successful quantum theories.