How to Read Sun Position: Solar Noon, Altitude, and Azimuth Explained

Most people understand sunrise and sunset immediately. The sun comes up, the sun goes down, and the clock tells you when. But once you start looking at a solar calculator, you run into extra terms: solar noon, sun altitude, and azimuth. Those numbers are not academic filler. They tell you where the sun is in the sky right now, how high it is, what direction it is shining from, and how the light will behave over the course of the day.

If you are using todaysuntimes.com, understanding these three ideas turns the site from a simple sunrise-sunset lookup into a practical planning tool. You can use it to predict shadow length, choose the bright side of a building, decide when a patio will be shaded, plan a photo shoot, or understand why winter light feels so different from summer light.

Solar Noon: The Sun’s Highest Point Today

Solar noon is the moment when the sun crosses your local meridian and reaches its highest altitude of the day. It is the midpoint of the sun’s daily path across your sky, not the midpoint between breakfast and dinner.

This is why solar noon usually does not happen at exactly 12:00 PM.

There are three main reasons:

• Time zones are broad. A whole time zone covers many degrees of longitude, so only a narrow north-south line is close to “clock noon” matching the sun.
• Daylight Saving Time shifts the clock. In much of the United States, summer solar noon often happens around 1:00 PM local clock time rather than noon.
• The equation of time shifts the sun’s schedule slightly through the year. Because Earth’s orbit is not perfectly circular and Earth’s axis is tilted, the apparent sun runs a little early or late compared with a uniform clock.

On many U.S. city pages, you will see solar noon somewhere around 12:45 PM to 1:20 PM in summer. That is normal. It does not mean the calculator is wrong. It means your clock and the real sun are not using the same definition of “noon.”

Why Solar Noon Matters

Solar noon is useful because it tells you when several things peak or bottom out:

• The sun reaches its maximum altitude for the day.
• Shadows are usually shortest at that time.
• Light is usually most overhead and least directional.
• South-facing or north-facing exposures receive their most direct midday light depending on location and season.

For practical use:

• Photographers often avoid solar noon for portraits because top-down light can be harsh.
• Gardeners can estimate which beds get true full sun.
• Homeowners can check when a yard, balcony, or window gets the most intense direct light.
• Solar panel owners can use solar noon as a reference point for peak sun angle.
• Hikers can use it as a rough anchor for daytime orientation.

In most of the continental United States, the sun is due south at solar noon. But not everywhere and not always. In low-latitude places such as Hawaii, there are times of year when the midday sun can pass extremely high and even slightly north of overhead. That is one reason solar position is more useful than relying on a generic rule like “the sun is always in the south.”

Sun Altitude: How High the Sun Is

Sun altitude is the angle of the sun above the horizon.

• 0° altitude means the sun is on the horizon, which is roughly sunrise or sunset.
• 10° altitude means the sun is low and the light is shallow and directional.
• 45° altitude means the sun is fairly high in the sky.
• 90° altitude would mean the sun is directly overhead.
• A negative altitude means the sun is below the horizon, even if the sky is still bright because of twilight.

This is one of the most useful solar measurements because it directly affects the character of light.

What Altitude Tells You About Light

When the altitude is low:

• Shadows are long.
• Light is warmer and more directional.
• Surface texture stands out more clearly.
• Window glare often becomes stronger on east- or west-facing sides.

When the altitude is high:

• Shadows get shorter.
• Light becomes more top-down.
• Contrast can become harsher around midday.
• South-facing walls and roofs receive stronger direct sun in most of the mainland U.S.

That is why a 6:30 PM summer sun does not feel anything like a 1:00 PM summer sun, even if both are bright. The altitude changes the entire visual quality of the scene.

A Quick Way to Think About Shadow Length

Altitude is also the best quick predictor of shadow length.

The lower the sun, the longer the shadow. The higher the sun, the shorter the shadow. You do not need trigonometry for casual use, but the relationship is strong enough that you can make reliable everyday judgments:

• At very low altitude, a tree, fence, or building can cast a shadow many times its own height.
• At mid altitude, shadows are moderate.
• Near the day’s maximum altitude, shadows are close to their shortest.

If you are trying to decide when a backyard will be shaded by a neighboring building, altitude matters more than sunrise or sunset alone.

Azimuth: The Compass Direction of the Sun

Azimuth tells you the sun’s compass direction along the horizon. On standard solar calculators, azimuth is measured clockwise from true north:

• 0° = north
• 90° = east
• 180° = south
• 270° = west

So if your solar data says the sun’s azimuth is 110°, the sun is a little south of due east. If it says 245°, the sun is in the southwest.

This is the number that answers questions like:

• Is morning light entering my east-facing kitchen yet?
• Is the sun far enough west to light the front of this building?
• Is the trail ahead going to be backlit?
• Will my patio be in direct sun or blocked by the house?

Azimuth changes continuously through the day. Around sunrise it will be near the eastern side of the horizon. Around sunset it will be near the western side. At solar noon, in most U.S. locations, it will be near due south. But the exact values shift with latitude and season.

Altitude and Azimuth Work Together

Altitude tells you how high the sun is. Azimuth tells you which direction it is in.

You usually need both.

For example:

• A sun at 15° altitude, 95° azimuth is low in the eastern sky shortly after sunrise.
• A sun at 68° altitude, 180° azimuth is high and due south around midday in many mainland U.S. locations.
• A sun at 8° altitude, 285° azimuth is low in the west-northwest shortly before sunset.

The same altitude can produce very different real-world effects depending on azimuth. A low sun in the east may flood a bedroom window. The same low altitude in the west may light a backyard but leave the front of a house in shade.

Why the Sun’s Path Changes Through the Year

The sun does not follow the same arc every day. Because Earth’s axis is tilted by about 23.44°, the daily path rises higher in summer and stays lower in winter.

That changes all three measurements:

• Solar noon altitude is much higher in summer than in winter.
• Sunrise and sunset azimuths shift northward in summer and southward in winter.
• Daylight duration expands and contracts along with the arc.

This is why winter sun in Chicago or Boston feels low all day, while summer sun climbs much higher and lingers longer into the evening. It is also why the same porch can be pleasantly sunlit in January but brutally exposed in July.

How to Use Sun Position on todaysuntimes.com

Each city page on todaysuntimes.com gives you solar numbers for representative city-center coordinates to help make these judgments:

• Solar Noon tells you when the sun peaks for the day.
• Sun Altitude tells you how high the sun is right now.
• Sun Direction tells you the sun’s azimuth in both degrees and compass form.
• The sky arc helps you visualize the daily path.
• The month and year tables let you compare how the same city changes across seasons.

A practical way to use the page is:

1. Check the current altitude and direction for the city.
2. Compare that with the direction your window, yard, trail, or subject faces.
3. Check solar noon to see whether the strongest overhead light is still ahead or already past.
4. Use sunrise, sunset, and twilight only after you understand where the sun actually is in between.

That is the step many people skip. They know when the sun rises and sets, but they do not know what it is doing in the ten or twelve hours between those events.

Real-World Examples

Photography

A portrait photographer usually wants lower sun altitude for softer, more directional light. If the azimuth shows the sun is in the southwest late in the day, you can choose a background or face angle that uses side light rather than flat front light.

Patios, Balconies, and Windows

If your balcony faces west, the key question is not just “what time is sunset?” It is “when does the sun’s azimuth swing far enough west to hit the balcony directly, and how high is it when that happens?”

Solar Panels

Panel output depends on the angle between sunlight and the panel surface. Solar noon is a reference point, but altitude and azimuth tell you how closely the sun aligns with the system throughout the day and year.

Hiking and Outdoor Planning

If a trail runs east-west, a low-altitude morning sun can create strong glare when heading east. A late-afternoon west sun can do the same in reverse. Azimuth tells you when that glare is likely.

The Main Idea

Sunrise and sunset tell you when the day begins and ends. Solar noon, altitude, and azimuth tell you how the sun behaves during the day.

That is the difference between knowing the schedule and understanding the geometry.

Once you start reading solar position this way, the numbers become intuitive. Solar noon tells you when the sun peaks. Altitude tells you how strong and high the light is. Azimuth tells you where it is coming from. Together, they explain shadows, glare, warmth, color, visibility, and the changing feel of outdoor spaces much better than sunrise and sunset alone.

References

• NOAA Solar Calculator Glossary
• NOAA General Solar Position Calculations