It should take into account the fact, that in the summer the sun shines much more in relation to the earth's surface, than in the winter so the same obstacle can thwart the use of solar casts a shadow .
Ni lazima kuzingatia ukweli, kwamba katika majira ya jua huangaza mengi zaidi katika uhusiano na nchi '; s uso, kuliko katika majira ya baridi hivyo kikwazo huo unaweza kuzuiza matumizi ya nishati ya jua Anamfukuza kivuli .