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ra is expressed in MJ m-2 day-1
ra_calculation(latitude, date)
A data.frame with the extraterrestrial radiation for daily periods
A dataframe with latitude in decimal degrees that you want to calculate the ra.
A dataframe with the dates that you want to calculate the ra.
Roberto Filgueiras, Luan P. Venancio, Catariny C. Aleman and Fernando F. da Cunha
if (FALSE) { ra <- ra_calculation(latitude, date) }
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