Praktické

Kalkulačka východu a západu slunce

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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

Latitude

+ North, − South

Longitude

+ East, − West

Date

What is Sunrise Sunset Calculator?

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Kalkulačka východu a západu slunce počítá přesné časy východu, západu a občanského soumraku pro jakékoli místo a datum pomocí astronomických vzorců.

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

How to Sunrise Sunset Calculator

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1Based on solar declination and hour angle calculations
2Input: latitude, longitude, and date
3Civil twilight: sun is 6° below horizon (sufficient light for outdoor activities)
4Day length = sunset time − sunrise time

Worked Examples

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Example 1

Given:London (51.5°N, 0.1°W), 21 June 2026

Výsledek:Sunrise ≈ 04:43 BST; Sunset ≈ 21:21 BST; Day length ≈ 16h 38min

Real-World Applications

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Calculating deadlines and project timelines

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Determining exact ages for legal or medical purposes

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Planning events and scheduling across time zones

London Day Length by Season

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Date	Sunrise (BST/GMT)	Sunset	Day length
21 Dec (winter)	08:02 GMT	15:58 GMT	7h 56min
20 Mar (equinox)	06:12 GMT	18:16 GMT	~12h
21 Jun (summer)	04:43 BST	21:21 BST	16h 38min
23 Sep (equinox)	06:54 BST	19:01 BST	~12h

Frequently Asked Questions

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What is Sunrise And Sunset?

A sunrise and sunset calculator computes the exact times of sunrise, sunset, and civil twilight for any location and date using astronomical formulae. Use this calculator for accurate, instant results.

How accurate is the Sunrise And Sunset calculator?

The calculator uses the standard published formula for sunrise and sunset. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

What units does the Sunrise And Sunset calculator use?

This calculator works with inches. You can enter values in the units shown — the calculator handles all conversions internally.

What formula does the Sunrise And Sunset calculator use?

The calculator applies the standard formula for this type of calculation. See the 'How It Works' steps above for the detailed formula breakdown.

References

›Solar calculations — NOAA

Porovnat s

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Sunrise Time vs Day Length

Formula-verified for precision

Reviewed October 2026

Our methodology

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