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-Units of Measurement and Time Lore
In short, both orders are correct. The months pass from Astral to Umbral in accordance with Conjury's elemental wheel. Each of the six elements posseses Astral and Umbral aspects and is reflected in the months.
The Eras on the other hand are periods of time, alternating between Umbral eras, where mankind suffers, and Astral eras where mankind rises from its own ashes.
In Eorzean chronology, the world as we know it was formed over 10,000 years ago when gods roamed the world and life was just beginning to flourish. This was known as "The Time of the Twelve." Then mankind came to Eorzea and the gods blessed them. But eventually the gods began to war among themselves and used the life they had created to fight their battles. The result was the first calamity, after which a dark time in man's history followed, known as the 1st Umbral Era. When mankind recovered and their civilizations flourished once more, so began the 1st Astral Era, the "Dawn of Man."
Hope that helps clarify things! ^^
-Units of Measurement and Time Lore
In short, both orders are correct. The months pass from Astral to Umbral in accordance with Conjury's elemental wheel. Each of the six elements posseses Astral and Umbral aspects and is reflected in the months.
The Eras on the other hand are periods of time, alternating between Umbral eras, where mankind suffers, and Astral eras where mankind rises from its own ashes.
In Eorzean chronology, the world as we know it was formed over 10,000 years ago when gods roamed the world and life was just beginning to flourish. This was known as "The Time of the Twelve." Then mankind came to Eorzea and the gods blessed them. But eventually the gods began to war among themselves and used the life they had created to fight their battles. The result was the first calamity, after which a dark time in man's history followed, known as the 1st Umbral Era. When mankind recovered and their civilizations flourished once more, so began the 1st Astral Era, the "Dawn of Man."
Hope that helps clarify things! ^^