Equation of Time (EoT), Solar Noon & True Solar Time Astronomy Calculator
Calculate True Apparent Solar Time (AST), astronomical Solar Noon clock time, and the Equation of Time (EoT in minutes) accounting for Earth's orbital eccentricity and axial obliquity.
Calculator Inputs
Live Real-TimeSolar Noon Clock Time (Decimal Hours)
Equation of Time (EoT in Minutes)
-1.49 mins
Longitude Time Correction (Minutes)
6.8 mins
Total Solar Offset (Minutes)
5.31 mins
Astronomical Precision: Accurately computes true solar transit across the local geographical meridian.
Solar Time Profile
Detailed Calculation Breakdown
Calculation Methodology
Equation of Time: EoT (mins) = 9.87*sin(2B) - 7.53*cos(B) - 1.5*sin(B), where B = 360/365*(Day - 81). Longitude Correction = 4 * (Local Longitude - Standard Meridian). Solar Time = Clock Time + Total Correction/60.
Important Legal & Educational Disclaimer
This celestial mechanics and astronomical geodesy tool calculates solar position kinematics.
This calculator is designed for educational and informational purposes only based on public statutory frameworks. The outputs do not constitute binding financial, tax, or legal advice. We assume no liability for decisions made based on these estimations. Always verify with the relevant official authorities or a certified professional advisor.
Frequently Asked Questions
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