Free Solar Noon Calculator
Estimate the local solar noon time from your longitude and the standard meridian of your time zone.
°
°
Offset from Clock Noon
-4.1 min
Solar Noon (decimal hrs)11.9313 hrs
Offset from Clock Noon vs Your Longitude
Solar Noon
Solar noon is when the Sun crosses your local meridian (highest point in the sky). It differs from clock noon because your longitude may not match your time zone's standard meridian.
Formula
Offset = (Standard Meridian - Your Longitude) × 4 minutes
Each degree of longitude corresponds to 4 minutes of solar time (360° / 24 hours = 15°/hour).
The equation of time (up to ±16 min seasonal variation) is not included here.
Example Calculation
New York City: longitude -73.97°, Eastern time zone meridian -75°.
- 01Offset = (-75 - (-73.97)) × 4 = -1.03 × 4 = -4.12 min
- 02Solar noon ≈ 12:00 - 4.12 min = 11:55:53
- 03The Sun is highest about 4 minutes before clock noon.