Overall, one of the most elusive elements of this civilization was a819-day calendaruntil now.

John H. Linden and Victoria R. Brickerpublishedtheir findings in the journalAncient Mesoamerica.

How much larger?Forty-five yearsto be precise.

Pyramid of Chichen Itzá at Sunset

Photo: SOMATUSCANI/Depositphotos

Mars may be the kicker for the overall length.

Overall, this finding is a testament to the advanced math and thorough astronomical observations of the Maya civilization.

Two scholars from Tulane University have finally figured out how the elusive 819-day Mayan calendar works.

Mayan relief carved in Palenque

Photo: tiagofernandez/Depositphotos

Mayan pyramid of the magician in Uxmal

Photo: isogood/Depositphotos