For thousands of years, ancient civilizations around the world used calendars based on a 360-day year.

The Sumerians, Babylonians, Egyptians, Mayans, and even early biblical records all point to a time when the calendar looked very different from the one we use today.

So what changed?

In this Case Reopened episode of The Ryan Files, Ryan Pelton explores one of the most fascinating mysteries in ancient history: the possibility that the structure of our calendar — and perhaps even the timeline of history itself — may not be what we think it is.

This episode examines ancient timekeeping systems, the transition to the Julian and Gregorian calendars, and the controversial Phantom Time Theory, which proposes that centuries may have been inserted into recorded history.

It also explores the recurring appearance of the 360-day year across multiple ancient cultures and the intriguing possibility that Earth’s orbital dynamics may have changed in the distant past.

Ancient calendars may have been more than tools for tracking days — they may have shaped civilization itself.

• Ancient 360-day calendars
• Sumerian, Babylonian, Egyptian and Mayan timekeeping
• Solar, lunar, and lunisolar calendars
• The Julian and Gregorian calendar reforms
• The Phantom Time Theory and missing centuries
• Biblical references to ancient calendars
• Lunar cycles and the 30-day month
• Earth’s orbital speed and calendar math
• Frequency, resonance, and natural rhythms

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