TrueCalendar

@truecalendar.bsky.social

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A social network for shared calendars & events. Follow curators, discuss dates, and bridge Gregorian, Ethiopian, Hijri, and Hebrew calendars. truecalendar.com

TrueCalendar daily fact: The 19-year Metonic cycle aligns 235 lunar months, with about two hours of error per cycle.
TrueCalendar daily fact: Neil Armstrong was born August 5, 1930 and became an engineer, aviator, test pilot, and astronaut.
TrueCalendar daily fact: The Badi calendar uses 19 months of 19 days plus intercalary days.
TrueCalendar daily fact: Historical dates should identify their calendar before a modern proleptic conversion is shown.
TrueCalendar daily fact: The IANA time-zone database records civil clock rules by place and historical period.
TrueCalendar daily fact: In Irish tradition, Lunasa marks the onset of August, autumn, and the harvest season.
TrueCalendar daily fact: Blue Moon can mean a month's second full Moon or a season's third full Moon when that season has four.
TrueCalendar daily fact: In a 400-year Gregorian cycle, the 13th falls on Friday 688 times - the highest weekday count.
TrueCalendar daily fact: The National Aeronautics and Space Act created NASA on July 29, 1958.
TrueCalendar daily fact: The Julian calendar's small annual mismatch accumulated into a ten-date correction in 1582.
TrueCalendar daily fact: The French Republican year used twelve 30-day months plus five or six complementary days.
TrueCalendar daily fact: Ancient Egyptians connected the pre-dawn return of Sirius with the Nile flood season and new year.
TrueCalendar daily fact: The 260-day Tzolk'in and 365-day Haab combinations repeat after 18,980 days.
TrueCalendar daily fact: Gregorian century years are leap years only when divisible by 400.
TrueCalendar daily fact: The Dog Days take their name from Sirius in Canis Major, not from hot weather affecting dogs.
Daily Time & Cosmos Card
TrueCalendar quiz asking which Apollo 11 milestone occurred on July 21 UTC.
Daily Time & Cosmos Card
Daily Time & Cosmos Card
Daily Time & Cosmos Card
Daily Time & Cosmos Card
Daily Time & Cosmos Card
Daily Time & Cosmos Card
Daily Time & Cosmos Card for July 15, 2026