Calendars and time
Solar Calendar
Direct answer
Solar Calendar: A Solar Calendar organizes its year to remain aligned with the seasonal cycle associated with Earth's revolution around the Sun.
A Solar Calendar keeps the calendar year aligned with the seasons.
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At a glance
- Found in
- Calendars & Timekeeping
- Related
- Calendar, Lunar Calendar, Lunisolar Calendar, Coordinated Universal Time
A Solar Calendar keeps the calendar year aligned with the seasons.
A cycle or timeline schematic for comparing the named timekeeping concept.
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The story behind Solar Calendar
Solar calendars developed through repeated comparison of civil dates with solstices, equinoxes, and the agricultural seasons.
Why Solar Calendar matters
Solar calendars make seasonal dates comparatively stable, but require rules such as leap days because the tropical year is not a whole number of days.
Solar Calendar in practice: an example
The Gregorian calendar uses leap-year rules to keep its year close to the seasonal year.
Where readings of Solar Calendar go wrong
It is a mistake to assume that every solar calendar uses the same months, epoch, or leap rule.
Sources and editorial method
Research references used for this entry include:
- U.S. Naval Observatory: Introduction to Calendars - Calendar definitions and the astronomical basis of solar, lunar, lunisolar, Julian, and Gregorian systems.
- U.S. Naval Observatory: Astronomical Almanac Glossary - Reference definitions for astronomical coordinates, events, calendars, and time scales.
- Source
- The Great Almanac Dictionary
- Category
- Calendars & Timekeeping
- Last updated
- 2026-09-26
Follow the seasonal year
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More in Calendars & Timekeeping
- UT1
- Astronomical Year Numbering
- Civil Calendar
- Draconic Year
- GPS Time
- ISO Week Date
- Local Sidereal Time
- Proleptic Gregorian Calendar
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Common questions
What is a Solar Calendar?
A Solar Calendar organizes its year to remain aligned with the seasonal cycle associated with Earth's revolution around the Sun.
What do people get wrong about a Solar Calendar?
It is a mistake to assume that every solar calendar uses the same months, epoch, or leap rule.
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