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La prossima domenica durerà 25 ore. L'ora legale lascerà il posto a quella solare e sposteremo le lancette dei nostri orologi indietro di un'ora. Ma quest'anno ci sarà un secondo intercalare orario, esattamente a capodanno.
Nella notte tra San Silvestro e capodanno sarà infatti aggiunto un secondo alla durata di riferimento, che dà il tempo a tutti i fusi orari, a livello globale. È quello che viene chiamato tecnicamente "tempo universale coordinato" (UTC). Questo avanzamento di tempo verrà applicato poiché attualmente la terra ruota più lentamente.
Il calcolo è stato eseguito dall'Ufficio internazionale dei pesi e delle misure di Parigi, a partire dai dati di circa 350 orologi atomici sparsi in 60 laboratori del tempo.
MABO
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