- The longest day of the year in the Northern Hemisphere.
- The sun rays at noon are directly overhead at the Tropic of Cancer (23.5°N latitude).
- Occurs due to Earth's axial tilt toward the Sun on that day.
- Associated with the beginning of summer in the Northern Hemisphere, which lasts until the September equinox.
December 21- Winter Solstice:
- The shortest day of the year in the Northern Hemisphere.
- The sun rays at noon are directly overhead at the Tropic of Capricorn (23.5°S latitude).
- Occurs due to Earth's axial tilt away from the Sun on that day.
- Associated with the beginning of winter in the Northern Hemisphere, which lasts until the March equinox.
Both dates mark specific points in the Earth's annual orbit around the Sun and are key reference points in astronomical seasons and day lengths throughout the year.