Neste novo ciclo, serão necessário 366 dias para a Terra da a volta em torno do Sol
Em 2020, não se assuste, teremos 366 dias. Isso ocorre a cada quatro anos: é o conhecido ano bissexto. Você sabe por que essas mudanças no calendário acontecem?
O ano é calculado pelo tempo necessário para a Terra dar uma volta em torno do céu. No entanto, a conta não é exatamente 365 dias – na verdade são 365, 2422 dias ou 365 dias, cinco horas e 48 segundos.
Para encaixar esse tempo extra, astrônomos arrendondaram a sobre para 6 horas e, a cada quatro anos, o excedente vira um dia a mais. Desta forma, é possível ajustara o calendário com menos transtornos.
O modo de contar os dias foi trazido pelo imperador Júlio César, de Roma, em 46 a.. O governante buscava solução para reformar o calendário romano.
Então, ele contratou Sosígenes de Alexandria, que propôs a adoção do calendário solar egípcio. No qual, a cada quatro anos, um dia seria acrescido para se adequar ao tempo que a Terra leva para girar em torno do Sol.
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