Equinox na kaka yana nufin lokacin shekara da Rana ta bayyana ta ketare ma'aunin sararin samaniya, wanda shine layin hasashen da ke kewaya ma'aunin duniya a sararin sama. Wannan yakan faru ne a kusa da ranar 22 ko 23 ga Satumba a yankin arewaci da kuma kusan 20 ga Maris ko 21 a yankin kudu. A lokacin kaka, dare da rana sun kai kusan daidai da tsayi, kuma yana nuna farkon kaka a hukumance a yankin arewaci da kuma farkon bazara a yankin kudu.