The reflected light of the moon at the Polar latitude generally highlights the so-called 'Rule of Twelfths' as the change is more pronounced away from New Moon or Full Moon -

https://www.moongiant.com/phase/08/19/2018

https://en.wikipedia.org/wiki/Rule_of_twelfths

It happens also in other areas of research such as the Solstices, tides and so on hence is far more relevant than the equalising of orbital geometries based on their periods and distance from the Sun. It is also more relevant to engineering as an object reaches it maximum height before falling so it is this observation that has more relevance than Kepler's comments on comparative orbits.