“Classical” option, where we obtain trigonometric functions - 4D spacetime - by using parallels:

Therefore, the horizontal axis (x) now shows us the coefficient of [b]time contraction[/b] k = t[sub]i[/sub]/t[sub]e[/sub], while the vertical axis (y) expresses [b]external speed[/b].[br][br]more on: [url=https://timetheory.net/]www.timetheory.net[/url]