1. What is Local Solar Time?

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

Purpose: It's used in solar energy applications, astronomy, and navigation to determine the true solar position regardless of time zones.

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 local and standard 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 orientation, and understanding true solar noon at a specific location.

4. Using the Calculator

Tips: Enter the local time in hours, standard longitude (for your time zone), local longitude (for your location), and the Equation of Time value for the 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., 75°W for Eastern Time), while local longitude is your exact location's longitude.

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

Q3: Why 4 minutes per degree of longitude?
A: Earth rotates 360° in 24 hours, so each degree equals 4 minutes of time (360°/24h = 15°/h → 60min/15° = 4min/°).

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

Q5: Does this account for daylight saving time?
A: No, ensure your local time input is in standard time (not DST) for accurate results.