What happens to the length of the day due to refraction of light?

One of the consequences of this effect of refraction is that contrary to what most people think, the day and night is not exactly 12 hours long on the days of the Equinoxes. Because of refraction of sunlight, daytime is just slightly longer than night time on March Equinox and September Equinox. This effect also has an impact on the time that the Moon can be seen before Moonrise and after Moonset.