it’s NOT just the Coriolis effect of rotation. it’s also the solar zenith angle. uh oh, i’m scared that the grad student may have forgotten that in his publication
zenith has jdays as an argument. jdays relies on get_curr_calday, which in turn, ultimately relies on time_manager.F90. time_manager.F90 has 86400 hard-coded in at many places (where it determines when a day turns into the next day), and does not call the value of 86400 in shr_const_mod.
Alex K. Chen's Exoplanet Climate Modelling 