On Wed, 1 Jan 2020 12:53:41 -0600 fmiser via Mercedes
<mercedes@okiebenz.com> wrote:
> The ball would be raise 5 min before the time mark, and on the
> time mark it would be dropped. Not lowered slowly - but the
> usually 10 m/s^2 of gravity. The beginning of the ball moving was
> the reference point in time. 12:00 and 13:00 were both common time
> marks, mostly depending on the country.
>
> As radios became prevalent, the need for time balls passed.
>
> There! I suspect most of you have now learned something new this
> year.
Yes, thank you!
But I must correct both you,
From https://physics.nist.gov/cgi-bin/cuu/Value?gn,
standard acceleration of gravity is:
Numerical value 9.80665 m/s^2
Standard uncertainty (exact)
From Wikipedia:
At different points on Earth surface, the gravitational
speed gain ranges from 9.764 m/s2 to 9.834 m/s2[2] depending
on altitude and latitude
and Clay,
K = deg.C + 273.16
7 deg.C = 280.16 K
Craig
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