darthmall / once-in-a-blue-moon

A visualization of how often a blue moon occurs according to various definitions of what constitutes a blue moon

Once in a Blue Moon

A data visualization that explores the phrase "once in a blue moon."

What is a blue moon?

There are two different definitions of what a blue moon is:

1. The second full moon in a month
2. The third full moon out of four in a season

This visualization explores how often a blue moon occurs under these different definitions and seeks to elucidate how rare a blue moon actually is.

Data

The data was scraped from NOAA's astronomical data set.