Yiziphi izizathu eziqondile zezikhathi zonyaka?
Iplanethi enguMhlaba ithambekele kuma-degree angu-23.5. Lokhu kubangela ukuba ama - hemisphere abe seduze noma kude nelanga. Futhi, ukuthambekela kwe-axial kushintsha inani lokukhanya kwelanga elifinyelela emhlabeni nganoma isiphi isikhathi.