December 21st is the 355th day of the year, 356th on leap years. It is also the Winter Solstice, the longest night of the year.
Events[]
In the Real World[]
- 2012: First episode of Our Mermaid Secret (Kaily Fazio)
- 2013: First episodes of Mermaid Scales (mermaidscales820) and My Mermaid Magic