Why We Have Seasons

WHY WE HAVE SEASONS SIMULATION

▸ Building the Sun & Earth’s orbit…

▸ Tilting the axis 23.5° — fixed direction toward Polaris

▸ Computing the lit zone & the day–night terminator

▸ Placing 4 markers: March equinox · June solstice · September equinox · December solstice

▸ Starting the orbit around the Sun…

▸ Ready — Online. ✅

Season compass

🍂 Bắc bán cầu

top view: Earth around the Sun

Orbital position—

Season (N. Hemisphere)—

Season (S. Hemisphere)—

Noon sun altitude—

Day length—

Distance to Sun—

Note

Seasons come from the 23.5° axial tilt, NOT from distance: perihelion (closest to the Sun) falls ~early January — when the Northern Hemisphere is in winter.

—

Pick a season marker or scenario on the right · drag Latitude to watch the sun angle & day length change

Your browser has not enabled canvas.

Noon sun angle & day length over the year sun angleday length