Calendário Gregoriano Proléptico
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<timefyi-glossary slug="proleptic-gregorian-calendar"></timefyi-glossary>Definição
Uma extensão do Calendário Gregoriano para datas anteriores à sua introdução oficial em 1582. Usado em cálculos históricos e astronômicos para evitar lacunas. A norma ISO 8601 usa o Calendário Gregoriano Proléptico.