Free · Find deep-blue photo light

Blue Hour Calculator

Estimate morning and evening blue hour using the sun's minus 8 to minus 4 degree range.

  • SunCalc 2 astronomy
  • Private in your browser
  • JSON and CSV downloads

Find blue hour

Use the sample place or enter coordinates. All times use the chosen time zone.

1
Choose place and timeCoordinates stay on this device
2
Read the sky planToronto · America/Toronto
Your local result will appear hereUse the sample place, then press the gold button.

Three simple steps

How to use it

  1. Choose the photo place and date.
  2. Read both blue-hour windows.
  3. Arrive early so you do not miss the short light.

Your place stays on this device

SunCalc does the sky math inside this browser tab. Bookify does not upload or save coordinates, dates, or times. Results assume a clear, level horizon; terrain, weather, and buildings can change what you see.