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
Guide détaillé à venir
Nous préparons un guide éducatif complet pour le Lever et Coucher du Soleil. Revenez bientôt pour des explications étape par étape, des formules, des exemples concrets et des conseils d'experts.
The Sunrise Sunset is a specialized quantitative tool designed for precise sunrise sunset computations. A sunrise/sunset calculator computes the times of sunrise, sunset, solar noon, and day length for any location and date. Times vary with latitude, longitude, and time of year due to Earth's axial tilt and orbital position. This calculator addresses the need for accurate, repeatable calculations in contexts where sunrise sunset analysis plays a critical role in decision-making, planning, and evaluation. This calculator employs established mathematical principles specific to sunrise sunset analysis. The computation proceeds through defined steps: Solar declination: the angle between the sun and the equatorial plane (varies −23.5° to +23.5°); Hour angle: the sun's position relative to solar noon; Sunrise/sunset occur when the sun is at −0.833° (accounting for refraction and sun's radius); Algorithm based on Jean Meeus's "Astronomical Algorithms". The interplay between input variables (Sunrise Sunset, Sunset) determines the final result, and understanding these relationships is essential for accurate interpretation. Small changes in critical inputs can significantly alter the output, making precise measurement or estimation paramount. In professional practice, the Sunrise Sunset serves practitioners across multiple sectors including finance, engineering, science, and education. Industry professionals use it for regulatory compliance, performance benchmarking, and strategic analysis. Researchers rely on it for validating theoretical models against empirical data. For personal use, it enables informed decision-making backed by mathematical rigor. Understanding both the capabilities and limitations of this calculator ensures users can apply results appropriately within their specific context.
Sunrise Sunset Calculation: Step 1: Solar declination: the angle between the sun and the equatorial plane (varies −23.5° to +23.5°) Step 2: Hour angle: the sun's position relative to solar noon Step 3: Sunrise/sunset occur when the sun is at −0.833° (accounting for refraction and sun's radius) Step 4: Algorithm based on Jean Meeus's "Astronomical Algorithms" Each step builds on the previous, combining the component calculations into a comprehensive sunrise sunset result. The formula captures the mathematical relationships governing sunrise sunset behavior.
- 1Solar declination: the angle between the sun and the equatorial plane (varies −23.5° to +23.5°)
- 2Hour angle: the sun's position relative to solar noon
- 3Sunrise/sunset occur when the sun is at −0.833° (accounting for refraction and sun's radius)
- 4Algorithm based on Jean Meeus's "Astronomical Algorithms"
- 5Identify the input values required for the Sunrise Sunset calculation — gather all measurements, rates, or parameters needed.
Applying the Sunrise Sunset formula with these inputs yields: Sunrise ≈ 5:25 AM · Sunset ≈ 8:31 PM · Day length ≈ 15 h 6 min. This demonstrates a typical sunrise sunset scenario where the calculator transforms raw parameters into a meaningful quantitative result for decision-making.
This standard sunrise sunset example uses typical values to demonstrate the Sunrise Sunset under realistic conditions. With these inputs, the formula produces a result that reflects standard sunrise sunset parameters, helping users understand the calculator's behavior across the typical operating range and build intuition for interpreting sunrise sunset results in practice.
This elevated sunrise sunset example uses above-average values to demonstrate the Sunrise Sunset under realistic conditions. With these inputs, the formula produces a result that reflects elevated sunrise sunset parameters, helping users understand the calculator's behavior across the typical operating range and build intuition for interpreting sunrise sunset results in practice.
This conservative sunrise sunset example uses lower-bound values to demonstrate the Sunrise Sunset under realistic conditions. With these inputs, the formula produces a result that reflects conservative sunrise sunset parameters, helping users understand the calculator's behavior across the typical operating range and build intuition for interpreting sunrise sunset results in practice.
Industry professionals rely on the Sunrise Sunset for operational sunrise sunset calculations, client deliverables, regulatory compliance reporting, and strategic planning in business contexts where sunrise sunset accuracy directly impacts financial outcomes and organizational performance
Academic researchers and university faculty use the Sunrise Sunset for empirical studies, thesis research, and peer-reviewed publications requiring rigorous quantitative sunrise sunset analysis across controlled experimental conditions and comparative studies
Feasibility analysis and decision support, representing an important application area for the Sunrise Sunset in professional and analytical contexts where accurate sunrise sunset calculations directly support informed decision-making, strategic planning, and performance optimization
Quick verification of manual calculations, representing an important application area for the Sunrise Sunset in professional and analytical contexts where accurate sunrise sunset calculations directly support informed decision-making, strategic planning, and performance optimization
When sunrise sunset input values approach zero or become negative in the
When sunrise sunset input values approach zero or become negative in the Sunrise Sunset, mathematical behavior changes significantly. Zero values may cause division-by-zero errors or trivially zero results, while negative inputs may yield mathematically valid but practically meaningless outputs in sunrise sunset contexts. Professional users should validate that all inputs fall within physically or financially meaningful ranges before interpreting results. Negative or zero values often indicate data entry errors or exceptional sunrise sunset circumstances requiring separate analytical treatment.
Extremely large or small input values in the Sunrise Sunset may push sunrise
Extremely large or small input values in the Sunrise Sunset may push sunrise sunset calculations beyond typical operating ranges. While mathematically valid, results from extreme inputs may not reflect realistic sunrise sunset scenarios and should be interpreted cautiously. In professional sunrise sunset settings, extreme values often indicate measurement errors, unusual conditions, or edge cases meriting additional analysis. Use sensitivity analysis to understand how results change across plausible input ranges rather than relying on single extreme-case calculations.
Certain complex sunrise sunset scenarios may require additional parameters beyond the standard Sunrise Sunset inputs.
These might include environmental factors, time-dependent variables, regulatory constraints, or domain-specific sunrise sunset adjustments materially affecting the result. When working on specialized sunrise sunset applications, consult industry guidelines or domain experts to determine whether supplementary inputs are needed. The standard calculator provides an excellent starting point, but specialized use cases may require extended modeling approaches.
| Latitude | Midsummer day length | Midwinter day length |
|---|---|---|
| Equator (0°) | ~12 hours | ~12 hours |
| Madrid (40°N) | ~14.5 hours | ~9.5 hours |
| London (51°N) | ~16.5 hours | ~7.5 hours |
| Reykjavik (64°N) | ~21 hours | ~4 hours |
| Arctic Circle (66.5°N) | Midnight sun | Polar night |
What is the Sunrise Sunset?
The Sunrise Sunset helps you calculate and analyse key metrics so you can make better-informed decisions without manual spreadsheet work. This is particularly important in the context of sunrise sunset calculations, where accuracy directly impacts decision-making. Professionals across multiple industries rely on precise sunrise sunset computations to validate assumptions, optimize processes, and ensure compliance with applicable standards. Understanding the underlying methodology helps users interpret results correctly and identify when additional analysis may be warranted.
What formula does the Sunrise Sunset use?
The core formula is: See formula field. The calculator walks you through each variable so results are accurate and explainable. This is particularly important in the context of sunrise sunset calculations, where accuracy directly impacts decision-making. Professionals across multiple industries rely on precise sunrise sunset computations to validate assumptions, optimize processes, and ensure compliance with applicable standards. Understanding the underlying methodology helps users interpret results correctly and identify when additional analysis may be warranted.
What inputs do I need?
You need the key variables listed in the formula — typically costs, revenue figures, or operational metrics. Hover over each field for guidance. This is particularly important in the context of sunrise sunset calculations, where accuracy directly impacts decision-making. Professionals across multiple industries rely on precise sunrise sunset computations to validate assumptions, optimize processes, and ensure compliance with applicable standards. Understanding the underlying methodology helps users interpret results correctly and identify when additional analysis may be warranted.
How accurate are the results?
Results are as accurate as the inputs you provide. Use realistic estimates based on historical data rather than aspirational targets for planning. This is particularly important in the context of sunrise sunset calculations, where accuracy directly impacts decision-making. Professionals across multiple industries rely on precise sunrise sunset computations to validate assumptions, optimize processes, and ensure compliance with applicable standards. Understanding the underlying methodology helps users interpret results correctly and identify when additional analysis may be warranted.
Can I use this for benchmarking?
Yes. Compare your result against the industry benchmarks shown in the reference table to understand where you stand versus peers. This is particularly important in the context of sunrise sunset calculations, where accuracy directly impacts decision-making. Professionals across multiple industries rely on precise sunrise sunset computations to validate assumptions, optimize processes, and ensure compliance with applicable standards. Understanding the underlying methodology helps users interpret results correctly and identify when additional analysis may be warranted.
How often should I recalculate?
Recalculate monthly or whenever a key variable changes materially — pricing, volume, costs, or market conditions can all shift the outcome significantly. This is particularly important in the context of sunrise sunset calculations, where accuracy directly impacts decision-making. Professionals across multiple industries rely on precise sunrise sunset computations to validate assumptions, optimize processes, and ensure compliance with applicable standards. Understanding the underlying methodology helps users interpret results correctly and identify when additional analysis may be warranted.
What are common mistakes when using this calculator?
The most common mistakes are using average figures instead of marginal ones, ignoring indirect costs, and failing to account for seasonality or one-time events. This is particularly important in the context of sunrise sunset calculations, where accuracy directly impacts decision-making. Professionals across multiple industries rely on precise sunrise sunset computations to validate assumptions, optimize processes, and ensure compliance with applicable standards. Understanding the underlying methodology helps users interpret results correctly and identify when additional analysis may be warranted.
Conseil Pro
Dawn and dusk are not the same as sunrise and sunset. Civil twilight begins 6° below the horizon (still quite light); nautical twilight at 12°; astronomical twilight at 18° (true darkness). Most daylight calculators show civil twilight.
Le saviez-vous?
At the Arctic Circle (66.5°N), there is at least one day of midnight sun in summer and one day of polar night in winter. In Tromsø, Norway (69.7°N), the sun doesn't rise for about 2 months each winter.