“Leap Second” Internet e servizi a rischio
“Leap Second” di martedì 30 giugno 2015. Riallineamento degli orologi atomici e rischio crash della rete. Ecco cosa accadrà.
Il prossimo “Leap Second” cadrà il 30 giugno 2015. Di cosa si tratta?
Il “Leap Second” non è altro che un minuto composto da 61 secondi. Il “super minuto” sarà l’ultimo della giornata di martedì 30 giugno. Il perché della necessità di un minuto più lungo di un secondo è da ricercare nel moto di rotazione della terra.
Questa rotazione, pur essendo continua non ha una velocità costante. Diversi fattori incidono sulla velocità di rotazione del nostro pianeta, tra questi i più conosciuti sono la luna, le maree e i cambiamenti climatici.
La variazione di velocità di rotazione causa un problema nella misurazione del tempo, di tanto in tanto è pertanto opportuno agire per annullare la differenza tra il moto terrestre e gli orologi atomici. Per questo motivo il 30 giugno (1 luglio in Italia) questi orologi atomici saranno fermati per un secondo.
Patrizia Tavella responsabile di Inrim (Istituto Nazionale di Ricerca in Metrologia) ha spiegato che non è possibile stabilire con largo anticipo quando si dovrà realizzare il riallineamento degli orologi atomici.
Quando i millisecondi di ritardo della Terra si accumulano fino a raggiungere un secondo intero si procede con il “Leap Second“, fermando gli orologi atomici per un secondo.
La strategia del “secondo extra” è stata introdotta per la prima volta il 30 giugno del 1972. Da allora si è verificato per ben 25 volte. L’ultimo “Leap Second” si è tenuto nel 2012.
La cosa può interessare anche gli utenti che utilizzano Internet e altri servizi. Un semplice riallineamento di un secondo ha causato nel 2012 il blocco di molti servizi e siti online come Mozilla, Linkedin, Reddit e altri. Potrebbero essere a rischio anche agenzie spaziali e sistemi aeroportuali.
Quindi se tra il 30 giugno e il primo luglio dovessero verificarsi disservizi su siti Web o altri servizi ricordate che è colpa del “Leap Second“. E’ proprio il caso di dirlo, a volte un secondo può fare la differenza.
Scritto da Michele Bellotti
mmm, esse, penso che all’interno del tour in giro per l’Italia sia previsto un mini-tour in bus a Roma Tra l’altro, noatte come hanno spostato sia Napoli che la mia Salerno (orgoglio campanilistico!) per riuscire nell’intento di ricreare una sagoma rimpicciolita dell’Italia.
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