Hexaëteris

A hexaëteris is the Greek name for the period within 6 tropical years where the Moon phase occurs around 6 days earlier.

It corresponds to 74 synodic months, 79.9828175276068 sidereal months, 80.30449221927401 draconic months, 79.30681173378679 anomalistic months, and 2,185.2635092592623 days.

Ben: The ultra supermoon 2016 was marked by the last lunar eclipse of 2022 after a hexaëteris.
Gregory: You know your stuff man.
Ben: Not to mention the last lunar eclipse of 2021 was a hexaëteris after my oldest grandfather's 81st birthday in 2015.
Gregory: Wow.

by gregben October 2, 2023