While I understand how coordinates work, I'm still trying to figure out how the last part relative to the azimuthal angle works, for example, in Minkowski metric-(adsbygoogle = window.adsbygoogle || []).push({});

[tex]c^2 {d \tau}^{2} = c^2 dt^2 - dr^2 - r^2\left(d\theta^2 + \sin^2\theta \, d\phi^2\right)[/tex]

while I get that [itex]\sin^2\theta[/itex] produces a figure that ranges from 0-1, I'd appreciate it if someone could define the range of figures [itex]d\theta^2[/itex] and [itex]d\phi^2[/itex] produce and what units are used (i.e. degrees, radians, degrees expressed as a fraction of 360).

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# How the last part relative to the azimuthal angle works

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