Geography and astronomy
Interactive 3D teaching toolkit

Real-time photorealistic 3D Earth: local time and time zones, circle of illumination, rotation and Coriolis force, tropics and polar circles. Live dashboard for city time differences, day length, and the subsolar point.

Elliptical orbit · Obliquity · Equinoxes and solstices · Subsolar-point migration. Adjustable obliquity — drag to 0° to remove the seasons and visualize their cause.

Geometric intuition for H = 90° − |φ − δ|. Latitude × date → live solar-altitude plot. Demonstrates that the poles do not always have the lowest solar altitude.

3D geometric demonstration of L = h/tan(H). At the equator on the March equinox, noon shadow length is zero. In the Southern Hemisphere, noon shadows point due north — challenging the "shadows always point north" misconception.

Celestial-dome view: simultaneously displays three arcs (June solstice · equinox · December solstice). Sunrise and sunset azimuths change live with latitude and date.

Latitude–date day-length heatmap. Seasonal changes in polar-day and polar-night coverage within the polar circles. Visualization of cos H₀ = −tan φ·tan δ.

Planetary wind systems migrate north–south seasonally. Coriolis switch: off, winds cross isobars; on, winds run parallel to isobars — helping explain monsoon formation.

Global warm- and cold-current streamlines, with fishing grounds and deserts labeled. Compare the Atlantic and Pacific — demonstrating that gyre patterns are governed by planetary winds rather than topography.

Celestial sphere, equatorial plane, ecliptic plane (angle 23.4°), and definition of the vernal equinox. Animation of the Sun's annual motion along the ecliptic, linking declination to seasons.

Elliptical orbit with adjustable eccentricity; real-time area sweep; T²∝a³ scatter plot. Speed peaks at perihelion — Earth actually travels faster in late December than in June!

Switch between linear and logarithmic scales. In linear mode, Neptune is at the screen edge and the Earth–Moon distance is almost invisible — a striking demonstration of scale. True relative sizes of the 8 planets.

Earth's dipole field lines · Solar-wind flow around Earth · Auroral oval. Auroras occur around magnetic latitudes 60-70°, rather than at the geographic poles — illustrating the distinction between magnetic and geographic poles.