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Sunrise & Sunset Calculator

发布时间:2026-09-01 | 浏览:1
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一键制作系统U盘仅需下载到电脑后接上U盘点一下全自动完成。
Calculators Finance Health Math Time/Date Other English Arabic Chinese Dutch French German Indonesian Italian Japanese Korean Polish Portuguese Russian Spanish Turkish Note: For high latitudes and certain seasons, some events may not occur (polar day/night). Other Calculators Share this calculator Easily share or copy the link to this calculator. Sunrise & Sunset Calculator: What It Shows and Why It Matters This Sunrise & Sunset Calculator provides accurate sunrise and sunset times for any location and date, along with day length, solar noon, and detailed twilight phases. It is useful for planning outdoor activities, travel, photography sessions, hiking, fishing, or stargazing. You can pick a city, use your current location, or enter coordinates to instantly view the times that matter for your day and night schedule. Choose a city by typing its name, or click Use my location to fill latitude, longitude, and UTC offset automatically. Select the date you want to check. Today is preselected for convenience. Click Calculate to see sunrise, sunset, day length, solar noon, and twilight windows. Optional: adjust the UTC offset if you are comparing locations or dates with different time standards or daylight saving rules. Use Reset to clear the fields and start a new search. Understanding the Results The results panel shows sunrise and sunset times in local clock time for the selected location and date. Day length is the total time between sunrise and sunset. Solar noon is when the sun reaches its highest point in the sky. Twilight ranges include civil, nautical, and astronomical periods, which describe how bright the sky remains before sunrise and after sunset. Civil twilight offers enough natural light for most outdoor tasks. Nautical twilight provides a darker sky that still reveals the horizon at sea. Astronomical twilight marks the transition to a truly dark night that is ideal for observing faint stars and deep-sky objects. You will also see golden hour windows around sunrise and sunset, favored by photographers for soft, warm light. Inputs Explained Type a city name and choose from suggestions. The calculator fills latitude, longitude, and a suitable UTC offset so the times display in local clock time for that place. Latitude and longitude Coordinates identify the exact location on Earth. Higher latitudes experience stronger seasonal changes in day length, including polar day or polar night near the Arctic and Antarctic circles. The UTC offset is the time difference from Coordinated Universal Time. It determines how the results appear on the clock for the chosen location and date, including dates that observe daylight saving time. Select any past or future date. Sunrise and sunset shift gradually through the year as Earth’s tilt changes the sun’s path across the sky. Outputs You Will See Sunrise and sunset times for the selected location and date. Day length, showing hours and minutes of daylight. Solar noon, the highest sun elevation of the day. Civil, nautical, and astronomical twilight ranges. Golden hour windows in the morning and evening. Notes for extreme latitudes when an event does not occur. Best Uses and Practical Ideas
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一键制作系统U盘仅需下载到电脑后接上U盘点一下全自动完成。
Plan photo shoots around golden hour, schedule morning runs or evening walks when the light is comfortable, or set fishing trips during low-light periods that often improve activity. Travelers can compare sunrise and sunset times across cities to plan tours. Campers and hikers use twilight windows for safe setup and navigation. Night-sky enthusiasts can target astronomical twilight for darker skies and better visibility. Behind the Math The calculator estimates the sun’s position from the date and Earth’s geometry. It accounts for the equation of time, solar declination, and standard refraction near the horizon to produce reliable times close to official almanac values. How to calculate: Sunrise and sunset The times come from when the solar elevation equals approximately −0.833°, which includes the sun’s apparent radius and typical atmospheric refraction near the horizon. How to calculate: Twilight phases Civil twilight uses −6°, nautical uses −12°, and astronomical uses −18° solar elevation. The calculator finds when the sun crosses each threshold in the morning and evening. How to calculate: Day length Day length is the difference between sunset and sunrise. At extreme latitudes, the sun may remain above or below the horizon all day, resulting in 24-hour daylight or darkness. How to calculate: Solar noon Solar noon occurs when the sun’s hour angle is zero, giving the local time when the sun reaches maximum elevation for that date and location. Tips for Better Planning Check golden hour windows on the exact date of your event, since the timing shifts every week. Compare day length across months to choose the most comfortable daylight schedule for training or commuting. Use nautical and astronomical twilight to plan night photography, meteor watching, or telescope sessions. Verify the UTC offset for trips that cross time zones or change daylight saving rules. At high latitudes, review the polar notes to understand days with no sunrise or no sunset. Imagine planning an evening photo session in Lisbon on June 21. Enter Lisbon, pick the date, and calculate. You will see a late sunset, a long day length, and golden hour in the evening leading into civil twilight. If you switch the date to December 21, the calculator shows a much earlier sunset and shorter golden hour, helping you adjust the schedule and gear for the available light. Everyday Planning Ideas and Examples The examples below illustrate common searches and scenarios people use when checking light and darkness by place and date. Adjust the location and date to match your plans. Sunrise time today in [city] for an early run or school drop-off schedule. Sunset time in [city] this weekend to plan a beach walk or rooftop dinner. Golden hour tonight in [city] for portraits with soft light before dusk. Civil twilight in the morning for safe cycling before work. Nautical twilight this month for coastal navigation exercises. Astronomical twilight in [city] for stargazing and Milky Way photography windows. Day length by date to choose the best month for a hiking itinerary. Sunrise and sunset by coordinates for remote campsites away from towns. Compare sunrise on two different dates to plan seasonal photo themes. Find the earliest sunset or latest sunrise each year to prepare winter routines. Sunrise & Sunset Calculator – FAQ Copyright 2025 – Global Calculator. All rights reserved.
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一键制作系统U盘仅需下载到电脑后接上U盘点一下全自动完成。