Sunrise Sunset Calculator

Using the calculator is straightforward. Here's what to do:

1. Enter your city, zip code, or geographic coordinates in the location field.
2. Pick a date using the date selector. It defaults to today, but you can look up any past or future date.
3. Hit the calculate button and review your results.

The results display in your local time zone automatically. If you're planning for a location in a different time zone, double-check that the displayed times match what you'd expect for that area. Some calculators also let you toggle between 12-hour and 24-hour formats, which is handy if you're used to military time or working with international teams.

Sunrise is the moment the upper edge of the sun's disk first appears above the horizon. Sunset is when that same edge disappears below it. These times shift every single day of the year, sometimes by just a minute, sometimes by several minutes at once depending on the season and your latitude.

Near the equinoxes in March and September, sunrise and sunset times change more quickly from day to day. Near the solstices in June and December, the rate of change slows down noticeably. If you live at a high latitude, like in Alaska or northern Canada, the difference between a winter day and a summer day is dramatic. We're talking about just a few hours of daylight in December versus nearly 20 hours in June.

The calculator accounts for your specific latitude and longitude to give you accurate local times. Elevation can play a small role too, since a higher vantage point means you'll see the sun a few seconds earlier at sunrise and a few seconds later at sunset.

Solar noon is the moment when the sun reaches its highest point in the sky for that day. It's not always at 12:00 PM on the clock. Depending on where you are within your time zone and what time of year it is, solar noon might fall anywhere from around 11:30 AM to nearly 1:30 PM in local clock time.

Daylight duration is simply the span of time between sunrise and sunset. Around the spring and fall equinoxes, most locations get close to 12 hours of daylight. At the summer solstice, daytime is at its longest. At the winter solstice, it's at its shortest. The further you are from the equator, the more extreme that swing gets.

Knowing your daylight duration matters for things like gardening, agriculture, solar panel planning, and general scheduling. A lot of people are surprised by how much it shifts from month to month, even at mid-latitudes like the continental United States.

Photographers live for golden hour. It's the period shortly after sunrise and shortly before sunset when the sun is low in the sky, casting warm, soft, directional light. Shadows get long, colors turn golden, and everything looks a little more cinematic. The exact window varies by location and season, but it typically runs about 30 to 60 minutes after sunrise and the same amount of time before sunset.

Blue hour comes just before sunrise and just after sunset. During this window, the sky takes on deep blue tones that you won't get at any other time of day. It's technically the period of twilight when the sun sits between about 4 and 6 degrees below the horizon. The light is soft, diffused, and surprisingly workable for photography, video shoots, and even just a quiet walk outside.

Both windows are short, so timing matters. Knowing the exact times ahead of your shoot or outing means you're set up and ready when the light hits, instead of scrambling.

Twilight isn't a single moment. It's a range of light conditions defined by how far below the horizon the sun sits, and it's broken into three distinct phases.

• Civil twilight begins when the sun is 6 degrees below the horizon. There's still enough natural light to see clearly without artificial lighting. This is what most people mean when they talk about dusk or dawn.
• Nautical twilight covers the range from 6 to 12 degrees below the horizon. The horizon is still visible at sea, which is why sailors historically used this period for celestial navigation. On land, it's noticeably darker and most outdoor activities require a light source.
• Astronomical twilight spans 12 to 18 degrees below the horizon. The sky is nearly dark enough for serious stargazing. Once the sun drops past 18 degrees below the horizon, it's considered true astronomical night.

For most practical purposes, civil twilight is what people care about day to day. But if you're into astronomy or astrophotography, knowing when astronomical twilight ends tells you exactly when the sky is dark enough to start capturing faint deep-sky objects.

The math behind sunrise and sunset times is rooted in celestial mechanics. The core inputs are your latitude, longitude, and the date. From those three values, it's possible to calculate the sun's position in the sky at any moment using well-established astronomical formulas.

The process involves figuring out the sun's declination (basically, how far north or south of the equator the sun appears to be on a given date) and then calculating the hour angle at which the sun crosses the horizon. Atmospheric refraction adds a small correction: because Earth's atmosphere bends light, the sun appears slightly above the horizon even when it's technically just below it. Calculators typically account for this by adding about 0.833 degrees to the solar zenith angle at the horizon.

Modern implementations use algorithms published by organizations like the U.S. Naval Observatory and the National Oceanic and Atmospheric Administration. These algorithms are accurate to within a minute or so for most locations and dates, which is plenty precise for any practical use.

A few variables directly influence when the sun appears to rise and set from your specific location.

• Latitude: The further you are from the equator, the more your sunrise and sunset times vary across the year. Tropical locations see relatively consistent day lengths year-round; polar regions see the most extreme variation.
• Longitude within a time zone: Time zones can span up to 15 degrees of longitude. A city on the eastern edge of a time zone will see the sun rise and set earlier on the clock than a city on the western edge, even if they share the same official time.
• Time of year: Earth's axial tilt causes the sun's apparent path across the sky to shift throughout the year, directly affecting how long it stays above the horizon.
• Elevation: Higher elevations give you a slightly earlier sunrise and later sunset because your line of sight to the horizon is lower relative to sea level.
• Local terrain: Mountains, valleys, and tall buildings can physically block the sun, meaning actual visible sunrise may be later and visible sunset may be earlier than the calculated times suggest.

The calculator works with geographic coordinates and standard atmospheric conditions. If you're in a deep valley or surrounded by tall structures, treat the results as a baseline and adjust based on what you can actually see from your location.

People reach for sunrise and sunset data for all kinds of reasons, some practical, some recreational.

• Photography and videography: Timing shoots around golden hour and blue hour is standard practice for outdoor photographers. Knowing the exact windows removes the guesswork.
• Outdoor recreation: Hikers, trail runners, and cyclists use sunrise and sunset times to plan safe outings, especially in areas without artificial lighting.
• Gardening and agriculture: Day length affects plant growth cycles, flowering times, and harvest schedules. Farmers and gardeners track daylight hours closely.
• Solar energy: Homeowners and engineers use daylight duration data to estimate solar panel output and plan system sizing.
• Religious observance: Many religious traditions tie prayers, fasts, or observances to specific solar events. Knowing precise times is important for accurate scheduling.
• Wildlife watching: Animals are often most active around dawn and dusk. Birders and wildlife photographers use these times to maximize sightings.
• Construction and event planning: Outdoor contractors and event coordinators plan work hours, lighting needs, and scheduling around available daylight.

Whatever your reason, having accurate solar data on hand saves time and helps you make better decisions. It's one of those small tools that turns out to be surprisingly useful once you start using it regularly.