azimut solar calculator

What Is Solar Azimuth?

Solar azimuth is the compass direction of the sun at a specific moment. It helps answer practical questions like: “Where is the sun right now?” and “Which direction should my panel face for better production?”

In most solar engineering references, azimuth is measured clockwise from true north:

• 0° = North
• 90° = East
• 180° = South
• 270° = West

How This azimut solar calculator Works

This calculator uses common solar geometry equations with three required inputs:

• Latitude of your site
• Day of year (to estimate solar declination)
• Local solar time (to determine hour angle)

From those values, it computes:

• Solar declination
• Hour angle
• Solar elevation
• Solar azimuth (compass bearing)

Important Note on Time Input

This tool expects solar time, not clock time. If you input clock time directly, your result can still be useful for rough planning, but it may differ from high-precision PV software that applies equation of time, longitude correction, and atmospheric refraction.

Why Azimuth Matters for Solar Panels

Panel orientation strongly influences annual energy generation. Azimuth is a major part of system design because it affects how directly sunlight hits the module surface over the day and across seasons.

• In the Northern Hemisphere, roofs facing near south are often preferred for maximum yearly yield.
• In the Southern Hemisphere, roofs facing near north are often preferred.
• East- or west-facing systems can still be attractive when matching morning/evening load profiles.

How to Use the Result

After you click Calculate Azimuth, the output gives a direction and angle. If you also enter panel azimuth, you’ll see the angular difference between where your array faces and where the sun is at that moment.

A smaller difference generally means better direct irradiance on the panel, especially when elevation is also favorable.

Quick Practical Workflow

• Pick representative days (equinoxes and solstices).
• Check several times (morning, noon, afternoon).
• Compare sun azimuth with your roof or array azimuth.
• Use this as a first-pass orientation check before detailed modeling.

Formula Snapshot

This page uses a standard declination approximation:

δ = 23.45° × sin[(360/365) × (284 + n)]

where n is the day of year. Hour angle is:

H = 15° × (SolarTime − 12)

Then azimuth is derived from trigonometric relationships involving latitude, declination, and hour angle.

Limitations

• Assumes clear geometric sun position (no cloud/shading model).
• Uses simplified declination equation.
• Does not include magnetic declination (true north vs magnetic north).
• Not a substitute for bankable production simulation.

Final Thoughts

If you’re planning a rooftop installation, this azimut solar calculator is a fast way to understand the sun’s path and evaluate direction choices. For final design decisions, pair this quick estimate with full PV software, on-site shade analysis, and local climate data.