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??,??? ????? Shade illuminated by entire clear blue sky , ????????
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????????? [ ???????? ]

  1. ↑ Cox, Clifford? "Dust Bowl" ? Perryton.com ? ???????? ????? ????-??-?? ?  
  2. ↑ ? USGS ???????=Volcanic Ash Impacts & Mitigation http://volcanoes.usgs.gov/ash/ ???????=Volcanic Ash Impacts & Mitigation |??????= ?? ??? ??????? ???? ( ??????? ) ? ???????? ????? ????-??-?? ?   |???????= ????????? ?? ???? ( ??????? )
  3. ↑ "Air mass (solar energy)" ? Wikipedia ? ???????? ????? ?? ?????? ???? ?  
  4. ↑ Bunning, Erwin; Moser, Ilse (?????? ????)? "Interference of moonlight with the photoperiodic measurement of time by plants, and their adaptive reaction" ( Scholar search ) ? Proceedings of the National Academy of Sciences of the United States of America ? 62 (4): 1018?22? ????? : 10.1073/pnas.62.4.1018 ? ????????   16591742 ? ??????   223607   অবাধে প্রবেশযোগ্য? ?????? : 1969PNAS...62.1018B ? ???????? ????? ????-??-?? ?  
  5. ↑ ? ? ? ? ? Schlyter, Paul (????)? "Radiometry and photometry in astronomy FAQ" ?  
  6. ↑ "Petzl reference system for lighting performance" ? ????-??-?? ?????? ??? ???? ??????? ??? ? ???????? ????? ????-??-?? ?  
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