I've been fascinated with this topic. A calendar for mars should tell you when there are transfer orbits available, the hours of solar light and so on. I tried to make it real and named it Whole Mars Calendar [1], any feedback would be appreciated
[1]:<a href="https://danieledep.github.io/whole-mars-calendar/" rel="nofollow">https://danieledep.github.io/whole-mars-calendar/</a>