Katkeeper points out that the IotD has featured a
green flash on the sun before so why not
today's ApoD, which is a red flash on the moon? OK.
You can see more green color at the top and more red at the bottom, too. ApoD explains:
While the long sight-line through the atmosphere filters and reddens the moonlight, it also bends different colors of light through slightly different angles, producing noticeable red (bottom) and green (top) lunar rims. Also captured here floating just below the Moon is a thin, red mirage (inset) -- in this case, an atmospherically magnified and distorted image of the red rim.