A guide to sunrise and sunset.

Sunrise is the estimated time when the upper edge of the Sun appears at the horizon. Sunset is when that edge disappears below it. The calculation assumes a level, unobstructed horizon and average atmospheric conditions.

Day length is the time between the estimated sunrise and sunset. Twilight extends beyond those times, so the sky can be light before sunrise and after sunset. For the astronomical definitions, see the U.S. Naval Observatory's guide to rise, set, and twilight.

Suntime estimates solar times from the date and the location's latitude and longitude using an approximation based on Ed Williams' sunrise and sunset algorithm. It uses a solar zenith of 90.833°, a conventional adjustment that accounts approximately for the Sun's apparent size and average atmospheric refraction at the horizon.

The result is an estimate for a coordinate, rather than a prediction of the view from a particular street or hill. The 30-day table begins with the current calendar date at the selected location.

Hills, buildings and trees can hide the horizon. Elevation and atmospheric conditions also affect what you see. Air pressure and temperature change how light bends near the horizon; Suntime uses a fixed approximation rather than live weather data.

Different services may choose different coordinates or calculation methods. Differences can be more noticeable at high latitudes, where the Sun crosses the horizon at a shallow angle. NOAA explains the limits of solar calculations.

For a city page, Suntime uses the listed city coordinate and its local time zone. On the home page, it can use an approximate location supplied by Cloudflare, or your device location when you give permission. If a usable location is unavailable, the home page uses Los Angeles.

Times are shown in the selected location's time zone. Where daylight saving time applies, the local clock can change by an hour even though the Sun's path changes gradually. When an estimated sunset falls after local midnight, the table marks it as the next day.

Earth's tilt changes the Sun's path across the sky through the year. Away from the equator, days generally grow longer toward summer and shorter toward winter. The seasons occur at opposite times in the Northern and Southern Hemispheres.

Near the equator, day length varies less over the year. Farther toward the poles, the seasonal difference becomes much larger. Compare two locations in the city list to see their next 30 days.

At high latitudes, the Sun can remain above or below the horizon for a full day. Suntime shows N/A when its calculation cannot produce a sunrise and sunset pair for a date. Around these periods, sunrise or sunset can also fall close to midnight.

For a sunrise walk or a sunset photograph, check the location and date first, then allow extra time for the route and local terrain. The table helps you compare the coming days; weather and the direction of your view will affect what you see.

For navigation, safety, or other decisions where precise timing matters, consult an appropriate authoritative source and local conditions.