Calendario Gregoriano Proléptico
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<timefyi-glossary slug="proleptic-gregorian-calendar"></timefyi-glossary>Definición
Una extensión del Calendario Gregoriano a fechas anteriores a su introducción oficial en 1582. Utilizado en cálculos históricos y astronómicos para evitar vacíos. La norma ISO 8601 utiliza el Calendario Gregoriano Proléptico.