Cool! This could be taken a step further, adding in the oscillation of the moons rotation for slingshot and accounting for the travel time between earth-moon-ma

Cool! This could be taken a step further, adding in the oscillation of the moons rotation for slingshot and accounting for the travel time between earth-moon-mars to come up with a good list of launch dates. I'm sure there are other factors, I'm not a rocket scientist.