**Given:**
Height of the pole = 60 cm
Length of the shadow = 20√3 m

**To find:**
Angle of elevation of the sun

**Solution:**

We can solve this problem using trigonometry. Let's consider the following diagram:

```
/|
/ |
/ |
/ |
/ |
/ |
/ |
/_______|
```

In the diagram, the vertical line represents the pole, the slanted line represents the shadow, and the line from the top of the pole to the end of the shadow represents the ray of sunlight.

Let the angle of elevation of the sun be θ.

We can see that the height of the pole, the length of the shadow, and the ray of sunlight form a right-angled triangle. Using trigonometry, we can relate the sides of the triangle as follows:

sin(θ) = opposite/hypotenuse = height of the pole / length of the shadow

Given that the height of the pole is 60 cm and the length of the shadow is 20√3 m, we need to convert the height to meters to match the units.

Height of the pole = 60 cm = 0.6 m

Now, we can substitute the values into the equation:

sin(θ) = 0.6 / 20√3

To solve for θ, we can take the inverse sin of both sides:

θ = sin^(-1)(0.6 / 20√3)

Using a calculator, we can find the value of θ to be approximately 1.53 degrees.

Therefore, the angle of elevation of the sun at this point of time is approximately 1.53 degrees.