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Sunset Time Calculator

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Times shown in UTC. For your local time, add your timezone offset. Approximation — actual times may differ by a few minutes.

Sunrise & Sunset Calculator

+ North, − South

+ East, − West

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Detailed Guide Coming Soon

We're working on a comprehensive educational guide for the Sunset Time Calculator in your language. The content below is shown in English.

What is Sunset Time Calculator?

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A sunset calculator computes the exact time of sunset and civil twilight for any location and date using solar position algorithms.

Calkulon makes complex calculations simple — built for students and everyday problem-solvers.

ಸೂತ್ರ

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f(x)Sunset time depends on latitude, longitude, date, and refraction. Uses NOAA algorithm or lookup tables.

Variable Legend

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ಚಿಹ್ನೆಹೆಸರುಘಟಕವಿವರಣೆ
φLatitudedegrees—
λLongitudedegrees—
tSunset timelocal time (HH:MM)—

How to Sunset Time Calculator

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  1. 1Based on solar declination, hour angle, and observer latitude/longitude
  2. 2Civil twilight ends when sun is 6° below horizon
  3. 3Nautical twilight: 12°; Astronomical twilight: 18°
  4. 4Equation of Time accounts for Earth's elliptical orbit

Worked Examples

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Example 1
Given:London (51.5°N), 21 December 2025
ಫಲಿತಾಂಶ:Sunset ≈ 15:58 GMT; Civil twilight ends ≈ 16:32 GMT

Real-World Applications

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🏗️

Photography planning (golden hour)

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Outdoor event scheduling

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Safety and security lighting

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Astronomical observation times

London Sunset Times by Season

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DateSunset (BST/GMT)Day length
21 Jun (summer)21:21 BST16h 38min
23 Sep (equinox)19:01 BST~12h
21 Dec (winter)15:58 GMT7h 56min
20 Mar (equinox)18:16 GMT~12h

Frequently Asked Questions

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Q

Why does sunset time change throughout the year?

A

Earth's axial tilt. Summer: sun higher arc, sets later. Winter: sun lower arc, sets earlier.

Q

Is sunset time the same everywhere?

A

No. Latitude determines sun angle. Longitude determines time zone. Terrain (hills, mountains) can block sun.

Q

What's the difference between sunset and twilight?

A

Sunset: sun touches horizon. Civil twilight: 6° below horizon (still light). Nautical: 12° below (navigational).

Formula-verified for precision
Reviewed October 2026
Our methodology

Ratings & comments

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