I am trying to understand the derivation of formulae for converting cartesian coordinates to latitude/longitude. I found a detailed description here (check link for more details) but it is not mentioned how the equation $$ \tag{3}\tan(\theta) = \frac{\sin(\Delta\lambda)\cos(\varphi_2)}{\cos(\varphi_1)\sin(\varphi_2)-\sin(\varphi_1)\cos(\varphi_2)\cos(\Delta\lambda)} $$ is built.
2026-03-26 06:20:38.1774506038
Where does this formula for tan(θ) come from?
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