The specific dates that mark the changing of seasons often serve as psychological and social resets. The "Spring Equinox" is synonymous with rebirth and cleaning, while the "First Day of Fall" often triggers a shift toward harvest themes and preparation for dormancy.

The table below lists the for each season in the Northern Hemisphere . Dates vary slightly (June 20–21, etc.) due to leap years and elliptical orbit.

Seasons are caused by Earth’s axial tilt (approximately 23.5°) relative to its orbital plane around the Sun. As Earth orbits, different hemispheres receive more direct sunlight, creating seasonal changes.

We often mark our lives by the calendar. We circle birthdays, mark anniversaries, and highlight holidays. But there is a deeper, older rhythm ticking away beneath the paper pages of our planners: the astronomical seasons.