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The default solar constant used in irradiance.get_extra_radiation is currently 1366.1 W/m².
Recent work revised the average solar constant to 1361.1 W/m² (see https://www.researchgate.net/publication/324269776_A_reevaluation_of_the_solar_constant_based_on_a_42-year_total_solar_irradiance_time_series_and_a_reconciliation_of_spaceborne_observations).
This new value seems now to be gaining broad acceptance, a.o. in certain standards.
Maybe it's a good time to update also the default value in pvlib to 1361.1 W/m².
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