Check local times and compare cities at a glance.
View all →Plan by date and explore holidays and celebrations worldwide.
View all →Follow local time and traditions to discover each city’s rhythm.
View all articles →Explore daylight and moonlight geometry at a selected instant.
Choose inputs and calculate to see your result.
Each map pixel tests the dot product between the surface normal and the modeled Sun or Moon direction. Moving the time slider recomputes the boundary; the base Earth texture is only geographic context.
Astronomy Engine 2.1.19 calculations, not direct observations. Rise/set uses the upper limb with standard refraction and a sea-level observer; terrain and local weather are not modeled.
Results are astronomical estimates, not a guarantee of visibility or a substitute for safe observation.
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