日の出・日の入り計算

How to use

1. Enter the latitude and longitude of your location (or click "Use my location").
2. Select the date you want to calculate for.
3. Sunrise, sunset, solar noon, and day length appear automatically.

Related time tools

• Lunar Calendar & Moon Phase
• World Meeting Finder
• World Clock
• Days Until Event

よくある質問

Is the sunrise/sunset calculator free?

Yes, completely free with no signup and no usage limits.

Does my data leave my device?

No. Solar calculations run entirely in your browser using astronomical algorithms. Nothing is sent to any server.

Does it work on mobile?

Yes. The tool is mobile-first and works on iPhone Safari and Android Chrome. Tap "Use my location" to auto-fill coordinates.