Seasonal & Astronomical Event Calendar
Track the seasons and major astronomical events. See dates for solstices, equinoxes, meteor showers, and eclipses. Plan around changes in daylight.
Current Season (Northern Hemisphere)
Spring
March 24, 2026
Starts:
Feb 20
Ends:
May 20
Duration:
90 days
Starts:
May 21
Ends:
Aug 22
Duration:
94 days
Starts:
Aug 23
Ends:
Nov 21
Duration:
91 days
Starts:
Nov 22
Ends:
Feb 19
Duration:
90 days
Year Overview
About Seasons
Seasons are caused by Earth's axial tilt of approximately 23.5 degrees. The Northern and Southern Hemispheres experience opposite seasons. Astronomical seasons begin on solstices and equinoxes, while meteorological seasons use fixed dates for consistency in record-keeping.
How the Seasonal Calendar Works
Select your hemisphere - Northern or Southern. The calendar displays the four astronomical seasons with their exact start and end dates for any year.
Enter a specific date to see which season it falls in. The tool calculates based on equinox and solstice dates, which vary slightly each year.
Current season information shows at the top with the season name, icon, and today's date. This updates automatically when you change the year or hemisphere.
Each season card displays the start date, end date, and total duration in days. Spring and autumn are typically around 92-93 days, while summer and winter vary.
A visual timeline shows the proportional length of each season throughout the year. Colors represent spring (green), summer (yellow), autumn (orange), and winter (blue).
When You'd Actually Use This
Gardening and planting schedules
Know exactly when seasons change for planting zones. Plan seed starting, transplanting, and harvest. Avoid frost damage by timing with seasons.
Event planning by season
Schedule outdoor events in appropriate seasons. Weddings, festivals, and sports depend on weather. Plan backup dates based on seasonal transitions.
Educational lesson planning
Teach astronomy, earth science, or geography with real dates. Show students why seasons differ by hemisphere. Plan seasonal activities and experiments.
Travel and vacation planning
Understand opposite seasons when traveling internationally. Summer in the US is winter in Australia. Pack appropriately and book seasonal activities.
Photography and nature activities
Plan for fall foliage, spring blooms, or winter landscapes. Know when golden hour light changes with seasons. Schedule nature photography trips.
Agricultural planning
Farmers use seasons for crop rotation and livestock management. Plan harvest festivals and farmers markets. Coordinate with seasonal labor needs.
What to Know Before Using
Astronomical vs meteorological seasons differ.Astronomical seasons begin on equinoxes and solstices (used here). Meteorological seasons start on the 1st of March, June, September, and December for consistent record-keeping.
Equinox and solstice dates vary.Seasons don't start on the same date every year. Leap years and Earth's orbit cause 1-2 day variations. Spring equinox can be March 19, 20, or 21.
Hemispheres have opposite seasons.When it's summer in the Northern Hemisphere, it's winter in the Southern Hemisphere. This tool adjusts all dates based on your hemisphere selection.
Season lengths aren't equal.Earth's elliptical orbit means seasons have different lengths. Northern summer is longer than winter because Earth moves slower when farther from the Sun.
Note: These are astronomical seasons based on Earth's position relative to the Sun. Weather patterns may not align exactly - meteorological spring can differ from astronomical spring.
Common Questions
When does spring start?
Spring begins on the vernal equinox, typically March 20 or 21 in the Northern Hemisphere. In the Southern Hemisphere, spring starts around September 22 or 23.
Why do equinox dates change?
Earth's orbit is 365.2422 days, not exactly 365. The calendar adds leap days to compensate, causing equinox times to shift. This results in date variations.
What is an equinox?
An equinox occurs when the Sun crosses the celestial equator. Day and night are approximately equal length worldwide. Happens twice yearly in March and September.
What is a solstice?
A solstice occurs when the Sun reaches its highest or lowest point in the sky. Results in the longest day (summer) or shortest day (winter) of the year.
Are seasons the same length?
No. Northern Hemisphere: spring ~92.8 days, summer ~93.6 days, autumn ~89.8 days, winter ~89.0 days. Variations are due to Earth's elliptical orbit.
Do other planets have seasons?
Yes, planets with axial tilt experience seasons. Mars has seasons like Earth. Uranus has extreme seasons due to its 98-degree tilt. Venus has virtually no seasons.
What causes seasons?
Earth's 23.5-degree axial tilt causes seasons. As Earth orbits the Sun, different hemispheres tilt toward or away from the Sun, changing sunlight intensity and duration.
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