Sun tools

Free, no-sign-up tools for planning around the sun — powered by the same engine as the SunCast app.

Sun Calculator

Search a place or move the map to see the sun’s direction and elevation at any time of day.

Sunrise, sunset, solar noon, day length, golden hour, blue hour and every twilight phase.

A month-by-month daylight curve with daily sunrise, sunset, solar noon, day length and change.

Morning and evening golden hour and blue hour times, with durations — for any place and date.

Sunrise and sunset times, their exact compass directions and the length of the day.

Forecast photographic light quality from cloud layers, visibility, precipitation and the exact solar event.

Estimate monthly and annual solar production from your roof area, direction, pitch and shade.

Explore upcoming eclipses, map total and annular paths, and calculate what you can see from any location.