I1S1O1H4E1L1S1
10 points
ISOHELS is validvalid
ISOHEL, a line on a map connecting points receiving equal sunshine [n]
ISOHEL, a map line indicating points of equal sunshine [n]
ISOHEL, a line on a map connecting points receiving equal sunshine [n]
ISOHEL, a map line indicating points of equal sunshine [n]