1580: Tawen
Ti tawen idi 1580 ket bisiesto a tawen a nangrugi iti Biernes (iparang ti silpo ti napno a kalendario) iti kalendario a Huliano, ken ti bisiesto a tawen a nangrugi iti Martes (iparang ti silpo ti napno a kalendario) iti kalendario a proleptiko a Gregoriano.
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