1. What is Local Solar Time?

Definition: Local Solar Time (LST) is the time based on the apparent position of the sun in the sky at a specific location.

Purpose: It's used in astronomy, solar energy systems, and various scientific applications where precise sun positioning is important.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( LST \) — Local Solar Time (hours)
• \( LT \) — Local Time (hours)
• \( STL \) — Standard Longitude (degrees)
• \( LOL \) — Local Longitude (degrees)
• \( EOT \) — Equation of Time (minutes)

Explanation: The formula accounts for the difference between standard and local longitude (4 minutes per degree) and the equation of time (which accounts for Earth's elliptical orbit and axial tilt).

3. Importance of Local Solar Time

Details: LST is crucial for accurate solar position calculations, solar panel alignment, sundial calibration, and astronomical observations.

4. Using the Calculator

Tips: Enter the local time in hours, standard longitude (for your time zone), your local longitude, and the equation of time value for your date.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between standard and local longitude?
A: Standard longitude is the reference longitude for your time zone (e.g., 0° for GMT, 120° for PST), while local longitude is your actual position.

Q2: Where can I find the Equation of Time value?
A: EOT tables are available online or can be calculated using specialized algorithms. It varies throughout the year (±15 minutes).

Q3: Why is the factor 4 used in the formula?
A: Earth rotates 1° every 4 minutes (360° in 24 hours = 15°/hour = 4 minutes/degree).

Q4: How accurate is this calculation?
A: Very accurate for most purposes, though extreme precision might require additional corrections.

Q5: Does this account for daylight saving time?
A: No, ensure your local time input doesn't include DST adjustments if you want true solar time.