م.د هناء مطر مهدي and أ.د علي مهدي جواد الدجيلي 2023. The relationship of hours of actual and theoretical brightness with the values of solar radiation in Najaf Governorate. Journal of College of Education. 52, 1 (Aug. 2023), 187–196. DOI:https://doi.org/10.31185/eduj.Vol52.Iss1.3645.