New York, USA
Lat: 40.71°•Lon: -74.01°
BLUE HOUR TWILIGHT WINDOW
09:57 PM – 10:09 PM
Optimal deep indigo sky contrast for illuminated architecture and cityscapes
First Light (Civil Dawn)11:49 AM
Sunrise12:20 PM
Solar Noon04:59 PM
Sunset09:38 PM
Last Light (Civil Dusk)10:09 PM
True Night (Astro Dusk)11:17 PM
Blue Hour Twilight Calculator
Solar Depression -6° to -4° Bracket•Cityscape Light Balance•Deep Indigo Sky Saturations•Tripod & Long Exposure Guidance
Master the Rich Cobalt Skies of Blue Hour
Blue hour happens during the deeper part of civil twilight when the sun is between 4 and 6 degrees below the horizon. As direct sunlight ceases, ozone absorption scatters a rich cobalt blue hue across the atmosphere, creating a stunning visual contrast with illuminated bridges, skyscrapers, and streetlamps.
Calculate both morning and evening blue hours for any location worldwide. Includes practical camera recommendations for low ISO, small apertures (f/8 to f/11), and long exposure stability.
How to Use the Blue Hour Calculator
1
Choose your target cityscape or landscape location.
2
Check the morning and evening blue hour timestamps.
3
Mount your camera on a sturdy tripod and set exposure times between 2 and 15 seconds.
Explore More Free Online Tools
Frequently Asked Questions
What is blue hour?
Blue hour is the period of twilight when the sun is significantly below the horizon and the residual sunlight takes on a deep saturated blue hue due to Chappuis absorption by the ozone layer.
When does blue hour happen?
Blue hour occurs twice daily: in the morning just before civil dawn/golden hour, and in the evening immediately following golden hour.
What camera settings are best for blue hour?
Use a tripod, low ISO (100–200), an aperture around f/8 to f/11 for sharp depth of field, and exposure times from 2 to 15 seconds.
Ready to Use the Blue Hour Calculator?
Scroll up to start using this tool immediately with zero setup required.