Presesi Aksial
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<timefyi-glossary slug="precession"></timefyi-glossary>Definisi
Goyangan lambat pada sumbu rotasi Bumi, menyelesaikan satu siklus penuh sekitar setiap 25.772 tahun (Tahun Platonik). Presesi menyebabkan ekuinoks musim semi melayang melalui konstelasi zodiak selama ribuan tahun.