Sunrise and sunset, twilights, golden hour and blue hour for any city and date, with day length, a month table and honest handling of days with no sun or no night.
The tool computes the Sun's apparent position in your browser for the chosen city and date, and every time of the day comes from it. Sunrise and sunset are the instant the upper edge of the Sun touches the horizon, with standard atmospheric refraction (34 arcminutes) and the Sun's radius (16 arcminutes), which puts the center of the Sun 0.833 degrees below the horizon. That is the same rule used by the U.S. Naval Observatory (USNO) and NOAA. Civil, nautical and astronomical twilight begin and end when the center of the Sun is 6, 12 and 18 degrees below the horizon. Golden hour and blue hour have no official definition. We use the Sun between -4 and +6 degrees for golden hour (the 0 to +6 and 0 to +10 variants are in the options) and between -8 and -4 degrees for blue hour, ranges that Wikipedia lists among those used by photography planning apps. The results were checked against NOAA's published algorithm in nine city and date combinations: sunrise, sunset and solar noon agree within 20 seconds. Example: in São Paulo on the December 21, 2026 solstice the Sun rises at 05:17 and sets at 18:52, and the day lasts 13h 36min, the longest of the year; on June 21 it is 10h 41min. London swings much more, from 7h 50min in December to 16h 38min in June. Limits: the calculation assumes sea level and a clear horizon. Hills, buildings, clouds and the real refraction of the day change when you actually see the Sun, and near the poles refraction is larger and less predictable. Inside the polar circles some days have no sunrise or no sunset, and the tool says so instead of inventing a time.
Paste the code into your HTML and the tool shows up on your page, without J-Kit's navigation and ads. It still runs in the browser of whoever visits your site.
<iframe
src="https://jkit.tools/embed/en-US/sunrise-sunset-calculator"
width="100%"
height="600"
style="border:0"
loading="lazy"
title="Sunrise, Sunset and Golden Hour"
></iframe>
<p style="font-size:12px;margin:6px 0 0">Tool by <a href="https://jkit.tools/en/tools/sunrise-sunset-calculator">J-Kit</a></p>Using it in a paper, class or post? Copy the link or a ready-made reference. The access date is today's.
<a href="https://jkit.tools/en/tools/sunrise-sunset-calculator">Sunrise, Sunset and Golden Hour</a>
These references help contextualize formulas, standards, APIs and limitations used on this page. They do not replace professional validation when a result has legal, financial, medical or operational impact.
Pick the city and date above. The time comes from the Sun's position calculated for the city's coordinates, in the city's time zone, with daylight saving time where it applies. In São Paulo on December 21, 2026 the Sun rises at 05:17 and sets at 18:52; on June 21, 2026, at 06:48 and 17:29.
Calculating the Sun...