Find Solar Declination Based on Your Zip Code  | Solar Declination Calculator
Find Solar Declination Based on Your Zip Code | Solar Declination Calculator

Find Solar Declination Based on Your Zip Code | Solar Declination Calculator

Solar Declination Calculator: The solar declination is the angle between the rays of the sun and the plane of the Earth’s equator. It varies throughout the year due to the tilt of the Earth’s axis. The solar declination can be calculated for any given date using the following formula:
δ = 23.45 sin ( 365 360 ( d 81 ) )


  • δ is the solar declination,
  • d is the day of the year.Keep in mind that the value of 23.45 is an approximate tilt of the Earth’s axis.

If we want a specific date’s solar declination, we can use the formula above, plugging in the day of the year for d. For example, for January 1st, d=1d=1, and for July 1st, d=182. We can then convert the result to degrees.

Solar Declination Calculator

Solar Declination Calculator

Also try Find Your Pluto Time Based on Your Zip Code | Pluto Light Calculator | Pluto Darkness Calculator | Pluto Hour Calculator

How to Use the Solar Declination Calculator:

Using the tool is a breeze, and here’s a step-by-step guide to get you started:

  1. Step 1: Enter Your ZIP Code
    Begin by entering your ZIP code into the designated input field. This allows the tool to fetch the geographical coordinates (latitude and longitude) of your location.
  2. Step 2: Choose a Date and Time
    If you want to explore the sun’s position at a specific moment, use the “Date and Time” input. The tool adapts to your selection, offering flexibility in exploring solar declination for different times.
  3. Step 3: Click “Calculate Solar Declination”
    Once you’ve entered the necessary information, click the “Calculate Solar Declination” button. The tool then uses a combination of geocoding and astronomical calculations to determine the solar declination for your specified location and time.
  4. Step 4: Explore the Result
    The tool presents the calculated solar declination, providing you with valuable information about the sun’s tilt relative to your location. This data is particularly useful for understanding sunlight patterns throughout the year.
Solar Declination calculator
Solar Declination calculator

How the Solar Declination Calculator Works:

  1. Geocoding from Zip Code: The tool convert the entered ZIP code into geographical coordinates and translates location information into usable latitude and longitude values.
  2. Astronomical Calculations: With the obtained coordinates, the Solar Declination Calculator employs astronomical calculations based on the Earth’s tilt and its orbit around the sun. The core formula used is:
δ = 23.45 sin ( 365 360 ( d 81 ) )

Here, δ represents the solar declination, and d corresponds to the day of the year. The result provides the angle at which the sun’s rays strike a particular location on Earth. For more accurate calculations you can visit NOAA Solar Calculator