Local mean solar minute-of-day for an instant at a longitude (UTC shifted by lng × 4 min, not the browser timezone).
lng × 4 min
The UTC instant.
Longitude in degrees.
The local solar minute-of-day in [0, 1440).
[0, 1440)
Local mean solar minute-of-day for an instant at a longitude (UTC shifted by
lng × 4 min, not the browser timezone).