For flat Earthers it is impossible to explain.
Yet another dishonest gratuitous statement. You never cease to outdo your own intellectual dishonesty. What we SEE in an eclipse entails simply an occlusion of the luminosity of one object. Could be caused or explained any number of scenarios that are not exclusive to a globe earth model, and the very understanding of what the moon actually is comes under fire from various experimental data and observations that seem to falsify it being a solid object, a mass of rock.