Why is a 'once-in-a-decade' Supermoon Blue Moon happening twice in 2 years? 

 Find out why the next Supermoon Blue Moon is happening on Aug. 19, 2024, but last year reports suggested it's happening in 2037. Both dates are correct. 

https://cdn.mos.cms.futurecdn.net/f7X6tpTywDxvkWmpYBojhQ.jpg

https://www.space.com/next-supermoon-blue-moon-2024-or-2037-why