Kwiingingqi ezingqonge i-Equator amahlathi emvula, ezinemozulu esoloko isina unyaka wonke, oku kukhula kwemithi kuba yinto eqhubekayo. Izazinge zomthi asinto esoloko ibonakala kunjalo nje akukho tshintsho apha emthini. Kwntsapho zemithi ezinezazinge qho ngonyaka, ezi zazinge zingabalwa kutsho kufunyanwe ubudala bomthi. Ngale ndlela, iinkuni ezithathwe emithini kwixesha langaphambili ingaziwa ubudala bayo, kuba ubukhulu bezazinge bahluke kakhulu. Le ke kuthiwa yidendrochronology. Imbalwa kakhulu imithi yetropika engabalelwa iminyaka yayo ngokuchanekileyo.