Lua azul - lua nova
Autor: Ronaldo Simas® | Publicado: 2012-09-04T10:08:00-07:00



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O
termo "once in a blue moon” (ou “uma vez na vida”, “raramente”) foi
cunhada em 1824 e se refere a eventos incomuns, mas não tão raros. No entanto,
a ocorrência de duas luas cheias no mesmo mês não é tão extraordinária como se
pensa. Na verdade, ocorre, em média, a cada 2,66 anos. E no ano de 1999,
aconteceu duas vezes em um período de apenas três meses.Por um longo tempo, a
origem do termo permaneceu obscura. Muitos anos atrás, nas páginas da revista
Natural History, especulei que poderia ter se originado do inglês arcaico
"belewe", que significa "trair". "Talvez", sugeri
no artigo, "a segunda lua cheia ‘traia’ a percepção corrente de que só há
uma única lua cheia por mês”. Mas apesar de ser inovadora, minha hipótese
provou estar completamente errada.


Lua azul - lua nova


Embora
a lua azul seja o nome atribuído à segunda lua cheia do mês, parece que não
damos o mesmo nome à segunda lua &nbsp;nova
do mês. No entanto, tais fases opostas parecem estar interligadas. Afinal, se
duas luas novas ocorrerem em um mesmo mês, na maioria dos casos, quatro anos
depois também haverá duas luas cheias em um mesmo mês. Por exemplo, houve duas
luas novas em agosto de 2008. Agora, quatro anos depois, agosto de 2012 será
agraciado com duas luas cheias.A próxima vez em que veremos duas luas cheias em
um único mês será em julho de 2015 (dias dia 1º e 31). Mas se você ainda tem o
calendário do ano passado, verá que no mês de julho houve duas luas novas: uma
no dia 1º e outra no dia 30.