Solar & Twilight Calculator Guide
Calculate exact sunrise, sunset, solar noon, and civil, nautical, and astronomical twilight for any coordinate.
Overview
Compute astronomical, nautical, and civil twilight along with sunrise, sunset, and solar noon for any latitude and longitude on Earth with high astronomical accuracy.
When to Use Solar & Twilight Calculator
Use Solar & Twilight Calculator for photography planning, astronomy dark sky observation, maritime navigation, or outdoor activity scheduling.
Inputs, Formats & Specifications
- Accepted Inputs
- Latitude (-90° to +90°), Longitude (-180° to +180°), Calendar Date
- Output Formats
- Civil dawn/dusk, Nautical dawn/dusk, Astronomical dawn/dusk, Sunrise, Sunset, Solar Noon, Total Day Length
- Supported Standards
- Decimal coordinates (WGS84), ISO 8601 times, UTC and local offsets
- Browser Limits & Scope
- Assumes standard atmospheric refraction at sea level; high mountain elevations or extreme polar midnight sun/polar night conditions produce continuous twilight.
How to use Solar & Twilight Calculator
- Select a major world city from the preset menu or type custom latitude and longitude coordinates.
- Choose your target date (defaults to today) using the calendar date picker.
- Click Calculate to view solar dawn, sunrise, solar noon, sunset, and dusk phases.
- Review the twilight breakdown card explaining the three official scientific twilight definitions.
Real-World Examples
Frequently Asked Questions
What is the difference between civil, nautical, and astronomical twilight?
Civil twilight occurs when the sun is 0°–6° below the horizon (adequate natural light). Nautical twilight is 6°–12° below (horizon visible at sea). Astronomical twilight is 12°–18° below (dark sky for astronomy).
Does this tool require my device location?
No, you can enter any coordinates manually or use default cities. Your location is never tracked or shared.
What is solar noon?
Solar noon is the exact moment when the Sun reaches its highest point in the sky for a given location, crossing the local celestial meridian.
Privacy & Data Security
Solar & Twilight Calculator queries verified public open data directly from your browser with zero tracking and zero API keys.