undefined | Better HN

0 pointshwillis2y ago0 comments

Local surface gravity varies by up to a ten-thousandth, about .001 m/s: https://en.wikipedia.org/wiki/Gal_(unit)

Sensitive detectors can measure differences in hundreds of millionths (10^-8 parts) or around .1 um/s^2.

A 1 million tonne mass on the other side of the earth will create a TOTAL acceleration of 4*10^-16. Changes in that will not be detectable.

0 comments

fho2y ago

Ah yes ... That's some orders of magnitude too much :-)

j / k navigate · click thread line to collapse

0 pointshwillis2y ago0 comments

Local surface gravity varies by up to a ten-thousandth, about .001 m/s: https://en.wikipedia.org/wiki/Gal_(unit)

Sensitive detectors can measure differences in hundreds of millionths (10^-8 parts) or around .1 um/s^2.

A 1 million tonne mass on the other side of the earth will create a TOTAL acceleration of 4*10^-16. Changes in that will not be detectable.

fho2y ago

Ah yes ... That's some orders of magnitude too much :-)

j / k navigate · click thread line to collapse