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Evergreen date guide

What is celebrated on December 21?

For 2026, these source-backed observances resolve to Monday, December 21. Recurring rules can move in another year, so each record keeps its own date logic.

Date authority profile

What this date contains

8 unique authority records

The list is deduplicated at the public entity layer while retaining all research provenance behind each page.

0 stable or rule-calculated

0 fixed annual and 0 reusable rule-based records can be placed without inventing a new date.

0 edition-specific

Edition-specific dates appear only when the requested year matches the verified edition; variable and historical records remain gated.

2 explicit country-scope records

Country scope stays attached to the underlying record instead of being generalized into a worldwide observance.

2 reviewed in-depth guides

These entities add reviewed meaning, history, activities, facts and FAQs without rewriting the authority facts.

Reviewed depth

Other in-depth guides on December 21

Source-backedFixed AnnualIn-depth guide

World Basketball Day

21 December · United Nations / international observance

A/RES/77/324

Source-backedFixed AnnualIn-depth guide

World Meditation Day

21 December · United Nations / international observance

A/RES/79/137

Explore the mix

Topics represented on December 21

All topics →
Arts, Entertainment & Lifestyle 3Animals, Nature & Environment 2Celebrations & Social 1Food, Drink & Hospitality 1Civic, Remembrance & History 1
8 date-resolved records

All observances on this date

Source-backedFixed Annual

Chester Greenwood Day

21 December annually in Maine · Maine statutory commemorative day honoring inventor Chester Greenwood; “Earmuff” in the canonical page title is descriptive rather than the statutory title

Maine law designates 21 December as Chester Greenwood Day in honor of the Farmington inventor associated with ear protectors/earmuffs.

Source-backedEdition Specific

December solstice

21 December 2026 at 20:50 UT · Global astronomical event / USNO 2026 season table

The U.S. Naval Observatory gives the December 2026 solstice at 20:50 UT on 21 December.

Source-backedEdition Specific

December solstice (Northern Hemisphere winter solstice)

21 December 2026 at 20:50 UT · Astronomical event / Northern Hemisphere seasonal naming

The U.S. Naval Observatory gives the December 2026 solstice at 20:50 UT on 21 December; seasonal naming depends on hemisphere.

Source-backedFixed Annual

National Coquito Day

21 December · Puerto Rican cultural/culinary context / Don Q-created informal seasonal observance

Don Q Rum announced National Coquito Day as an annual December 21 observance and described the 2018 formalization of the day.

Source-backedFixed Annual

National Crossword Puzzle Day

21 December · United States / crossword-puzzle appreciation observance

The U.S. Census Bureau’s current December education calendar lists National Crossword Puzzle Day on December 21; the U.S. House Historian has also acknowledged the December observance.

Source-backedFixed Annual

National Maine Day

21 December · United States / National Day Calendar National State Days series — Maine

National Day Calendar lists National Maine Day on 21 December. The U.S. Senate records Maine’s admission/statehood date as 15 March 1820. The two dates are deliberately kept separate so the…

Source-backedFixed AnnualIn-depth guide

World Basketball Day

21 December · United Nations / international observance

A/RES/77/324

Source-backedFixed AnnualIn-depth guide

World Meditation Day

21 December · United Nations / international observance

A/RES/79/137

How this date is built

This page is assembled from verified fixed dates, reusable recurrence rules, and target-year records whose edition matches 2026. Variable, historical or unresolved records are not silently forced onto this date.

Read the methodology →