Buenos Aires的日出日落
Buenos Aires sits at 34.6037° S, 58.3816° W in Argentina, on the America/Argentina/Buenos Aires timezone. On 2026年4月21日, the sun rises at 07:22 local time, reaches its highest point at 12:53, and sets at 18:24 — giving Buenos Aires 11 hours and 2 minutes of daylight.
About daylight in Buenos Aires
Because Buenos Aires is located at a latitude of roughly 34.6037° S, its daylight length swings across the year. In the southern hemisphere, the longest day falls around June 21 (the shortest day for southern cities), and the shortest around December 21 (the longest day for southern cities). The greater the latitude, the more pronounced the seasonal contrast — a city near the equator sees a daylight swing of only a few minutes across the year, while a city above 60° latitude can see a swing of more than eight hours.
The sunrise and sunset times above assume a mathematical horizon and an observer at sea level. Local topography — mountains to the east or west — can delay sunrise or hasten sunset by several minutes in real observation. Atmospheric refraction also bends sunlight, which is why the sun appears to rise slightly before it geometrically crosses the horizon and linger slightly after it has set. The golden hour and civil twilight figures in the live widget below account for this refraction using the same algorithm astronomers use.
How these times are calculated
Sunrise and sunset are computed from Buenos Aires's exact latitude and longitude using a solar position algorithm that accounts for the tilt of Earth's axis, the date's solar declination, and the observer's geographic location. Civil twilight is the period when the sun is between 0° and 6° below the horizon; nautical twilight runs from 6° to 12° below; and golden hour is the window of warm, low-angle light photographers love, which lasts roughly an hour after sunrise and before sunset at mid-latitudes but stretches far longer near the poles in summer.
All times are rendered in Buenos Aires's local timezone (America/Argentina/Buenos Aires). If daylight saving time is in effect on a given date, the calculation automatically applies the current offset — you do not need to add or subtract an hour yourself. Dates are set using your browser's calendar in the live widget, so comparing the same date across multiple cities is straightforward.