Celstial Calendar: The Moon & the Perseids

• Autores: Alan MacRobert
• Localización: Sky and telescope, ISSN 0037-6604, Vol. 128, Nº. 2, 2014, pág. 52
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • Every three years the Moon displays similar phases on the same dates on the calendar. The rule of thumb is that every phase happens just three days earlier than it did three years ago, on average.