Ko te whakamaarama marama he huarahi ki te rongoa i te mate whakararu o te kaupeka (SAD) me etahi atu tikanga ma te rongo ki te rama hangai.Ko te SAD he momo pouri ka puta i tetahi wa i ia tau, i te nuinga o te wa i te ngahuru, i te takurua ranei.
Ka tino whai hua te whakamaarama marama ina he pai te whakakotahitanga o te kaha marama, te roa me te wa.