Calendar
Yearly calendar with all months at a glance - holidays and moon phases
January
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February
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March
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April
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May
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June
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July
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August
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September
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October
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November
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December
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2027 Holidays at a Glance
Common year - 365 days
US federal holidays
- Jan 1: New Year's Day
- Jan 18: Martin Luther King Jr. Day
- Feb 15: Presidents' Day
- May 31: Memorial Day
- Jul 4: Independence Day
- Sep 6: Labor Day
- Oct 11: Columbus Day
- Nov 11: Veterans Day
- Nov 25: Thanksgiving
- Dec 25: Christmas Day
🎉 Fun Facts
- •📅 Friday the 13th Frequency: Every calendar year has at least one Friday the 13th, and at most three - the longest possible gap between Friday the 13ths is 14 months (426 days), and any month starting on a Sunday will have a Friday the 13th.
- •🗓️ The Calendar Repeat Cycle: There are only 14 possible calendar configurations (7 for common years starting on each day of the week, 7 for leap years) - meaning every year is identical to some past year, and 2026's calendar is exactly the same as 1999, 2010, and will repeat in 2037.
- •⏰ The Lost 11 Days: When Britain switched from the Julian to Gregorian calendar in September 1752, they skipped 11 days - going directly from September 2 to September 14 - causing riots from people who believed their lives were being "shortened."
- •🌍 New Year's Not Universal: While most of the world celebrates January 1, the Chinese New Year (Jan 21-Feb 20), Islamic New Year (moves 11 days earlier each year), Jewish New Year (Rosh Hashanah, Sept/Oct), and Ethiopian New Year (Sept 11) all fall on completely different dates.
- •📊 October/December Name Paradox: October means "8th month" and December means "10th month" in Latin, but they're the 10th and 12th months - this happened because the Roman calendar originally started in March, making October the 8th and December the 10th until January and February were added later.
Moon & Astronomical Events
- •🌕 Full Moon Names: Full moon names (Wolf Moon, Harvest Moon, etc.) come from Native American and Colonial American sources - different tribes had different names, and the most commonly used list is a combination from various Algonquian tribes.
- •🌙 Blue Moon Definition: A "Blue Moon" has two definitions: the 3rd of 4 full moons in a season (traditional), or the 2nd full moon in a calendar month (popularized by a 1946 magazine error that stuck) - they occur every 2.7 years on average.
- •🌓 Moon Phase Cycle: The moon completes a full phase cycle every 29.53 days - this is why 12 lunar months (354 days) is 11 days short of a solar year, causing lunar calendars to drift without adjustment.
- •🌑 New Moon Invisibility: The new moon is invisible because the moon is between Earth and the sun - what many people call a "new moon" (crescent) is actually a waxing crescent, 1-2 days after the true new moon.
- •🌕 Supermoon Science: A "supermoon" (full moon at perigee) appears 14% larger and 30% brighter than when the moon is at apogee - the term was coined by astrologer Richard Nolle in 1979, not by astronomers.
- •☀️ Solstice Sun Position: On the summer solstice, the sun rises and sets at its northernmost points on the horizon and is at its highest noon position - ancient monuments like Stonehenge align with these positions.
- •🌍 Equinox Equals Day/Night: The equinoxes (Mar 20 & Sept 22) don't actually have exactly 12 hours of day and night - atmospheric refraction and the sun's diameter mean daylight is ~8-10 minutes longer than night.
- •🌘 Harvest Moon Timing: The Harvest Moon (full moon nearest the fall equinox) rises only 25-30 minutes later each night instead of the usual 50 minutes - this gave farmers extra light to harvest crops, hence the name.