World Geography
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Solar system, Earth's motions, latitudes and time
Time difference from longitude
\Delta t = \Delta\lambda \times 4\ \text{minutes}
1° of longitude = 4 min; 15° = 1 hour
Local time
T_{\text{local}} = T_{\text{GMT}} \pm \frac{\lambda}{15}\ \text{h}
+ for east longitudes, − for west