Kaip apskaičiuoti Sunset Time
Kas yra Sunset Time?
A sunset calculator computes the exact time of sunset and civil twilight for any location and date using solar position algorithms.
Formulė
Sunset time depends on latitude, longitude, date, and refraction. Uses NOAA algorithm or lookup tables.
- φ
- Latitude (degrees)
- λ
- Longitude (degrees)
- t
- Sunset time (local time (HH:MM))
Žingsnis po žingsnio vadovas
- 1Based on solar declination, hour angle, and observer latitude/longitude
- 2Civil twilight ends when sun is 6° below horizon
- 3Nautical twilight: 12°; Astronomical twilight: 18°
- 4Equation of Time accounts for Earth's elliptical orbit
Worked Examples
Įvestis
London (51.5°N), 21 December 2025
Rezultatas
Sunset ≈ 15:58 GMT; Civil twilight ends ≈ 16:32 GMT
Frequently Asked Questions
Why does sunset time change throughout the year?
Earth's axial tilt. Summer: sun higher arc, sets later. Winter: sun lower arc, sets earlier.
Is sunset time the same everywhere?
No. Latitude determines sun angle. Longitude determines time zone. Terrain (hills, mountains) can block sun.
What's the difference between sunset and twilight?
Sunset: sun touches horizon. Civil twilight: 6° below horizon (still light). Nautical: 12° below (navigational).