Bonne projection of the Earth, standard parallel is <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \pi /4}"><semantics><mrow class="MJX-TeXAtom-ORD"><mstyle displaystyle="true" scriptlevel="0"><mi>π<!-- π --></mi><mrow class="MJX-TeXAtom-ORD"><mo>/</mo></mrow><mn>4</mn></mstyle></mrow><annotation encoding="application/x-tex">{\displaystyle \pi /4}</annotation></semantics></math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/1707aa0fec2c8ef008b9e30b6045fbf95dab9e20" class="mwe-math-fallback-image-inline" aria-hidden="true" style="vertical-align: -0.838ex; width:3.657ex; height:2.843ex;" alt="{\displaystyle \pi /4}"></span>.  Source image is from NASA's Earth Observatory "Blue Marble" series.
<a href="//commons.wikimedia.org/wiki/User:Mdf" title="User:Mdf">Mdf</a>
<span class="int-own-work" lang="en">Own work</span>