Calendarios: la pista del tiempo

Redacción:
 		 Alastair Sarre
 
Edición: Academy staff
 
Revisión: Dr Nick Lomb
Curator of Astronomy and Timekeeping
Sydney Observatory (part of the Powerhouse Museum)
The Rocks, Sydney, New South Wales 
Versión española:
y redacción del apartado
¿Por qué se acortan los años? 		 Antonio Parra

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