Kuka keksi Gallin-Petersin projektion?
Petersin projektio
{'answer_start': array([-1]), 'answer_text': array([''], dtype=object)}








x



=
R
λ




y



=
2
R
sin
⁡
φ






{\displaystyle {\begin{aligned}x&=R\lambda \\y&=2R\sin \varphi \end{aligned}}}

