কীভাবে Sunset Time গণনা করবেন
Sunset Time কি?
A sunset calculator computes the exact time of sunset and civil twilight for any location and date using solar position algorithms.
সূত্র
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))
ধাপে ধাপে নির্দেশিকা
- 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
সমাধান করা উদাহরণ
ইনপুট
London (51.5°N), 21 December 2025
ফলাফল
Sunset ≈ 15:58 GMT; Civil twilight ends ≈ 16:32 GMT
সচরাচর জিজ্ঞাসা
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).