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5 votes
Accepted

Pendulum clock correction

There are a couple of oddities I see in this working. I'm not completely clear if $l_0$ is the length at zero celcius or at the equator, at 50 celcius. But I'll go with your interpretation, that 300 =...
James K's user avatar
  • 123k
3 votes

Sundial (solar clock) in a binary star system

The sun forms a useful basis for measuring time because to a reasonable approximation it stays put, and the rotation of the Earth causes it to traverse the sky once every 24 hours. Provided the ...
James K's user avatar
  • 123k
1 vote
Accepted

Can I use the Tokyo Skytree as clock?

In most sundials, the gnomon is aligned with the Earth's polar axis so that the shadow indicates the Sun's hour angle. A vertical tower instead casts a shadow indicating the Sun's azimuth. The time of ...
Mike G's user avatar
  • 18.7k
1 vote

Can I use the Tokyo Skytree as clock?

Anything which casts a shadow can become a sundial, as JH's comment points out. The other thing you need to know is the latitude of the building, as that affects the change in shadow direction per ...
Carl Witthoft's user avatar

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