Daily solar flux as a function of latitude and time

•Analytic formulae derived for incident top-of-atmosphere solar irradiance normal to the Earth’s surface (i.e., solar flux) as a function of Earth-axis tilt and latitude.•Net daily solar flux tabulated vs. latitude at top of atmosphere throughout year.•Utilizes latest values of solar irradiance and Earth-orbit.•Describes derivations and correction factors for computational transparency.