Sign Error in Julian Date Calculation

[Atom-Timing]

The code incorrectly adds the observer's longitude (east) instead of subtracting it when computing the approximate solar transit time ($Japprox). This mistake shifts predicted times by approximately 4 minutes per degree of longitude. For example, London (≈0.13°E) would see ~30-second errors, while New York (≈74°W) could have discrepancies of ~8 minutes.

This error systematically delays sunrise/sunset predictions for eastern longitudes and advances them for western longitudes.

// Incorrect line in calculateSun():
$Japprox = 2451545 + 0.0009 + ($this->lon / 360) + $n;
// Fixed line:
$Japprox = 2451545 + 0.0009 + (-$this->lon / 360) + $n;