Ka whai ake i ngā ture a Kepler, ka haere ia ahanoa i runga i tētahi pororapa, ā, kotahi tonu te arotahi o te rā. Ko ngā ahanoa e tata atu ana ki te rā (me ngā tuaka ā-nui iti iho) ka tere haere nā te mea he nui ake te pānga ki a rātou o te tō ā-nuku o te rā. I runga i tētahi pororapa pororapa, ka rerekē te tawhiti o tētahi tinana mai i te rā i roto i te tau. Ko te wāhi tata rawa o tētahi tinana ki te rā e kiia ana ko tōna perihelion, ā, ko tōna wāhi tawhiti rawa atu i te rā e kiia ana ko tōna aphelion. Ko ngā pororapa o ngā aorangi he porohita tata, engari he maha ngā komete, ngā aorangi, me ngā ahanoa o te whitiki Kuiper e whai ana i ngā pororapa pororapa pororapa. Ka taea te matapae i ngā tūnga o ngā tinana i roto i te pūnaha solar mā te whakamahi i ngā tauira tau. Pātai: He aha ngā ahanoa katoa e arotahi ana i runga i ngā ture a Kepler?
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