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Den 01.08.2024 13:39, skrev Richard Hachel:Czrtesian coordinates? Yet another>A very stupid notation!
The event that occurred at the supernova located at 15,000 ly has just been recorded by the Earth observer.
He notes E = (x, y, z, To, t)
Let x = 12000, y = 9000, z = 0, To = -15000, t = 0.
This is how I write in Hachel notation.
Giving the position of a star in Cartesian coordinates
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