Sun Tracker
The sun's path across the flat-plane disk, updated to your current UTC time. Move the slider to trace 24 hours; observe how the daytime hemisphere sweeps westward as the sun moves.
The current sun position over the flat-plane azimuthal projection, calculated from your local time. Move the time slider to see how the sun's path traces over a 24-hour cycle.
What You're Seeing
The map is the azimuthal-equidistant projection — the flat-plane representation. The cyan dot shows the sun's position above the disk at the selected time. The yellow arc is the illuminated hemisphere (where it's daytime).
Note how the illuminated zone moves westward as time progresses — this is the same observed daytime/nighttime cycle, but on the flat plane it's the sun moving over the disk, not the disk rotating beneath the sun.
Seasonal Variation
This visualization shows the equinox path (sun's circular path centered over the equator). At solstices, the path expands toward the Tropic of Cancer (June) or contracts toward the Tropic of Capricorn (December). The sun spirals between these two latitudes annually.