Initializing, please wait a moment

Quando usar Equation of Time 3D Explorer


Use this explorer when you want to understand sundials, the analemma, and why solar noon drifts from clock noon; skip it when you want the globe or the Moon.


The numbers side by side

AspectEquation of Time 3D ExplorerTypical alternative
Install size0 MB - runs in the browserDesktop astronomy software varies
PriceUSD 0Often paid software
Sundial vs clock gapUp to ~16 min ahead / ~14 min behindStatic analemma chart without year scrub
  • Classroom demos of the analemma and the equation of time
  • Explaining why a sundial does not match a clock
  • Separating the tilt effect from the eccentricity effect

This is an educational visualization using a standard approximation, not drawn to exact scale.

Walk the controls in the step-by-step guide, or compare options in vs alternatives. Open the Equation of Time 3D Explorer.