Fig. 11
From: Characterising the three-dimensional ozone distribution of a tidally locked Earth-like planet
Phases of an exoplanet as seen by an observer. The phases \(\varphi = 0\)°, \(\varphi = 90\)°, \(\varphi = 180\)° and \(\varphi = 270\)° have been marked. In phase \(\varphi = 0\)°, only the planet’s day side is visible. In phases \(\varphi = 90\)° and \(\varphi = 270\)°, half of the day side and half of the night side are visible. In phase \(\varphi = 180\)°, only the night side is visible