@@ -183,5 +183,5 @@ The *escape velocity* of a planet is defined as the minimal initial velocity an
[^2]: The actual function may of course contain multiple terms which are summed, but all those must have the same dimension. Operators like sines and exponentials must be dimensionless, as there are no dimensions of the form $\sin(M)$ or $e^L$. The only allowable dimensional dependencies are thus power laws.
[^3]: The method is sometimes referred to as the Rayleigh algorithm, after John William Strutt, Lord Rayleigh (1842-1919), who applied it, among other things, to light scattering in the air. The result of Rayleigh's analysis can be used to explain why the sky is blue.
[^3]: The method is sometimes referred to as the Rayleigh algorithm, after [John William Strutt, Lord Rayleigh](https://en.wikipedia.org/wiki/John_William_Strutt,_3rd_Baron_Rayleigh) (1842-1919), who applied it, among other things, to light scattering in the air. The result of Rayleigh's analysis can be used to explain [why the sky is blue](https://en.wikipedia.org/wiki/Rayleigh_sky_model).
@@ -642,7 +642,7 @@ A small ball of mass $m$ is aligned above a larger ball of mass $M$ with a sligh
[^1]: Or carry out, as you please.
[^2]: Though Tsiolkovsky certainly deserves credit for his pioneering work, and he likely derived the equation independently, he was not the first to do so. Both the British mathematician William Moore in 1813 and the Scottish minister and mathematician William Leitch in 1861 preceded him.
[^2]: Though Tsiolkovsky certainly deserves credit for his pioneering work, and he likely derived the equation independently, he was not the first to do so. Both the British mathematician [William Moore](https://en.wikipedia.org/wiki/William_Moore_(mathematician)) in 1813 and the Scottish minister and mathematician [William Leitch](https://en.wikipedia.org/wiki/William_Leitch_(scientist)) in 1861 preceded him.
[^3]: Photograph of Konstantin Eduardovich Tsiolkovsky, unknown date and photographer, obtained from [Wikimedia commons](https://commons.wikimedia.org/wiki/File:Tsiolkovsky.jpg), public domain.
