It is for the Tech Team - my proble is still unsolved Refereing to online help of ENVI 4.1 on ENVI_COMPUTE_SUN_ANGLES. If you look at the explanation of argument GMTime the 2:30 PM is represented as 1430 rather than 1450 if the accompanying Example is correct. If argument expalnation is correct then in Example 10:45 PM should be 2245 rather than 2275. Kindly clarify whether the GMTtime minutes range from 00 to 60 or 00 to 100.