Typical diurnal course of the Moon’s equatorial surface temperature according to Diviner radiometric measurements and simulations by the revised TWO model (based on data in Figure nine(a) of Vasavada et al. 2012). Also shown are the maximum (T
), minimum (T
) and mean (T
) temperature of the lunar Equator. In agreement with Hölder’s inequality, T
= 213 K is about 57 K cooler than the Moon’s effective emission temperature (270.2 K) calculated from Eq. (3).