Step 1 Local Time & Local Solar Time

Step 1.1 Determine Eastern/Western Hemisphere

• In Google Maps, right click the location in the map and it will show {latitude, longitude}.

• From longitude:

  • 0 to +180 = East (E)

  • 0 to -180 = West (W)

Step 1.3 Calculate LST

LST Local solar time (h)

LT Local time in 24 hour format (h)

k Conversion factor = 4 (min per °), regardless country because it's earth self-rotation speed

Lsite Longitude of the site (°)

EoT Equation of time (min)

LSTM Longitude of the standard meridian of the site / Local Standard Time Meridian (°)

• LSTM = 15° x UTC Offset in hours

May cross check LST with Real-Time Solar Time - mysolartime.com 

Site Survey Time: 1300

• UTC Malaysia = +8h

• LSTM = 15° x (+8) = +120° (120° East)

• LST = 13 h + [4 x (101.5419 - 120)] + (+14) =  13 h - 59.8324 min = 12 h : 0.17 min