What is the best way to track the sun for a two axis solar tracker?

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To effectively track the sun for a two-axis solar tracker, using a combination of light sensors is essential. One user suggests employing three photo-resistors to measure light intensity gradients by comparing voltages. Another proposed solution is utilizing a CCD camera aimed directly at the sun for more precise tracking. Additionally, incorporating a position sensor can enhance the system's accuracy. These approaches aim to optimize the functionality of the solar tracker.
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ineed your help please ihave two stepper motors and iwant to used in two axis solar tracker but ihaving aproblem in the light sensor icant decided yet the pest kind of sensor,and there are need to use aposition sensor also in my plant.
 
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I've built a two axis solar tracker before using 3 photo-resistors. By comparing the voltage across any two of the resistors angled slightly away from each other you can determine an intensity gradient from the light source to track.

The ultimate solution would be to use a CCD camera aimed at the sun.
 

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