Editing Gall–Peters projection (section)

===Formula===
The projection is conventionally defined as:

:<math>\begin{align}
  x &= \frac{R\pi\lambda\cos 45^\circ}{180^\circ} = \frac{R\pi\lambda}{180^\circ\sqrt{2}}\\
  y &= \frac{R\sin \varphi}{\cos 45^\circ} = R \sqrt{2} \sin \varphi
\end{align}</math>

where ''λ'' is the longitude from the central meridian in degrees, ''φ'' is the latitude, and ''R'' is the radius of the globe used as the model of the earth for projection. For longitude given in radians, remove the {{sfrac|{{pi}}|180°}} factors.