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  4. How do we measure the idea of time?
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How do we measure the idea of time?

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Offline Bored chemist

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Re: How do we measure the idea of time?
« Reply #20 on: 21/12/2018 14:16:57 »
Once you know the distance from the Sun to the Earth you can use the orbit of the Earth as a baseline for triangulation (wrt the so called "fixed stars".

That lets you know the distance to the planets.
That lets you know the orbital radii .
You can watch them go round + find out their orbital period.

And then you can do essentially the same bit of arithmetic as I did for the Earth.

None of this is complicated- it's high school maths.
Quote from: opportunity on 21/12/2018 13:50:39
Have you read the Principia?
No.
It's in Latin.
 But I might find a translation to read over Xmas.

Quote from: opportunity on 21/12/2018 13:50:39
Do you know the statements?
What statements?
Please try to write stuff that makes sense. I can't read your mind.
Quote from: opportunity on 21/12/2018 13:50:39
The issue here is how the solar revolution and triangulated distances took either distance or speed.
You seem to think it is an "either/ or" thing.
The measurements give you distance and speed.
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Offline opportunity (OP)

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Re: How do we measure the idea of time?
« Reply #21 on: 22/12/2018 00:43:36 »
The Principia is an interesting read, and no it wasn't in Latin when I took a look, yet it was written in latin.

The following is a good summary of what I was looking for:

https://www.quora.com/How-did-Newton-calculate-the-distance-between-the-Earth-and-the-Sun-to-calculate-the-mass-of-the-Earth

What I am still looking for is that although Newton the relative distances and speeds, and calculated masses thereabouts of the planets, what did he put the different speeds of the planets down to?
« Last Edit: 22/12/2018 00:53:38 by opportunity »
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