🌅 日出日落时间计算器Sunrise & Sunset Calculator
根据经纬度和日期计算日出、日落、正午时间、白昼时长和民用晨昏蒙影时间。Sunrise, sunset, solar noon, day length and civil twilight from latitude, longitude and date.
使用说明与常见问题How-to & FAQ
「日出日落时间计算器」是什么？What is the Sunrise & Sunset Calculator tool?
根据经纬度和日期计算日出、日落、正午时间、白昼时长和民用晨昏蒙影时间。Sunrise, sunset, solar noon, day length and civil twilight from latitude, longitude and date.
如何使用「日出日落时间计算器」？How do I use the Sunrise & Sunset Calculator tool?
在「日出日落时间计算器」中，填写「日期」、「纬度」、「经度」、「时区(UTC±小时)」、「常用城市」等参数，结果会随输入实时计算并显示在下方。In the Sunrise & Sunset Calculator: Fill in "Date", "Latitude", "Longitude", "Time zone (UTC±h)", "Preset city"; results are recalculated instantly as you type.
计算精度如何？How accurate is it?
采用美国海军天文台简化算法，通常误差在 1–2 分钟以内；未考虑海拔和地形遮挡。Uses the US Naval Observatory simplified algorithm, usually within 1–2 minutes; elevation and terrain are ignored.
和时区有关吗？Do time zones matter?
有关。「日出日落时间计算器」按你填写的时区（UTC±小时）显示时间，不读取设备的时区。常用城市预设填的是标准时间（如纽约 −5）；在实行夏令时的季节请自己把时区加 1（如纽约夏季填 −4）。Yes. The Sunrise & Sunset Calculator shows times in the time zone you enter (UTC±hours), not your device's. The preset cities use standard time (New York −5, for example); during daylight saving time add 1 yourself (New York in summer is −4).
「日出日落时间计算器」免费吗？需要注册吗？Is the Sunrise & Sunset Calculator free? Do I need an account?
「日出日落时间计算器」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Sunrise & Sunset Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.