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Daylight Analytics
—SunTimeToday calculates accurate sunrise time, sunset time, day length, and twilight phases for any location on Earth using solar algorithms — no data collection, all calculations run in your browser.
Find Sunrise & Sunset for a City
What Is SunTimeToday?
SunTimeToday is a free, offline sunrise and sunset calculator that provides precise solar times for any location on Earth. By entering your latitude and longitude, you instantly get today's sunrise time, sunset time, day length, and twilight phases — all computed locally in your browser.
Unlike weather apps that only show a single city estimate, our tool processes your exact geographic coordinates to account for atmospheric refraction, horizon elevation, and the Earth's axial tilt. The result is a solar calculation accurate to within seconds, whether you are in New York, Tokyo, or a remote village in the Andes.
How Our Solar Calculator Works
Our calculator uses the SunCalc library, which implements the Jean Meeus astronomical algorithms to determine the sun's position relative to any point on Earth. The computation factors in your timezone, the equation of time, and atmospheric refraction to produce accurate civil twilight and solar noon values.
When you grant geolocation access, the tool automatically detects your position and begins calculating in real time. If you prefer manual input, select a city from our database of 17 global cities or enter custom coordinates. Every calculation runs entirely in your browser — no data is sent to any server.
Why Sunrise and Sunset Data Matters
Accurate sunrise and sunset times are essential for photographers planning shoots around the golden hour, for solar energy engineers optimizing panel tilt angles, and for outdoor enthusiasts scheduling hikes, runs, and camping trips during safe daylight hours.
Beyond recreation, solar timing data supports circadian rhythm research, agricultural planning, and aviation operations that depend on legal daylight flying rules. Our tool makes this data accessible to everyone, instantly and without cost.
Frequently Asked Questions
How can I find the precise sunrise time for my location?
In my experience, using this tool's automatic location lookup is the fastest way to get the exact sunrise and sunset times for your immediate vicinity. I have found that GPS coordinates yield much higher accuracy than generic city-level estimates, especially if you are near mountains or high terrain where the horizon is altered.
What is the difference between civil, nautical, and astronomical twilight?
When I observe the sky after sunset, I notice three distinct phases: civil twilight is when there is still enough light to see without lamps, nautical twilight is when the horizon becomes blurry and sailors historically navigated by stars, and astronomical twilight is the final dark transition where I can finally spot faint galaxies and deep space objects without atmospheric glare.
Why does the day length change so dramatically throughout the year?
During my travels across different latitudes, I have clearly observed how the Earth's axial tilt of 23.5 degrees causes the sun's path to shift daily. In summer, the hemisphere tilts toward the sun, giving us prolonged day length and late sunset times, while in winter the opposite occurs, resulting in short daylight windows and extended night durations.