scorecompute
All demonstrationsGOLDEN & BLUE HOUR / RUST CPU

Find the light before you go.

Choose a date and location. Calculate the golden and blue light windows in one UTC day, including high-latitude cases where familiar sunrise patterns disappear.

plan_golden_hourTry the real call
Concept artwork · not calculation evidence
01 / UNDERSTAND THE METHOD

See the angle. Find the window.

ILLUSTRATION · NOT A CALCULATION
THE LIGHT INSTRUMENTIllustration · no ephemeris
Preparing the solar instrument…

Golden: −4° to +6°. Blue: −6° to −4°. The returned UTC windows remain available below.

0° · ideal horizon
Blue −6° to −4° Golden −4° to +6°
3.0°Golden bandTeaching angle, not the selected location’s Sun

This instrument explains elevation thresholds. Its moving Sun, angle and horizon are illustrative. It does not simulate the selected day, azimuth, terrain or weather.

Teaching animation only · no MCP request
02 / ASK THE ACTUAL TOOL

Make it your experiment.

CHOOSE A PLACE TO START

Load a UTC day and location, then run the real calculation. These buttons do not call the engine.

Complete tool arguments

Arrays, coordinates and nested contracts remain editable here. Units and limits are checked by the real tool.

Runs only when you press the button. Input edits discard the previous displayed result. Public compute limits apply.

KNOW WHAT THE RESULT MEANS

Useful evidence needs boundaries.

  • These are explicit photographic conventions, not universal definitions or a forecast of beautiful light.
  • The horizon is ideal. Terrain, buildings, clouds, aerosols and weather are not modeled.
  • The separate −0.833° crossing is a solar-centre convention, not an official refracted upper-limb sunrise.
  • The 0.25-second search tolerance is numerical precision, not astronomical accuracy. Timestamp resolution is one millisecond.
  • The input domain is 1900–2100; independent oracle tests cover selected reference cases, not every date in that range.
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