Can we ever witness a complete circular rainbow from the surface of the Earth ?

Explanation

To determine whether we can witness a complete circular rainbow from the surface of the Earth, we need to analyze the formation of rainbows and the observer's position in relation to the anti-solar point.

### Step-by-Step Solution:

1. **Understanding Rainbow Formation**:
- A rainbow is formed due to the refraction, dispersion, and reflection of sunlight in water droplets. The light is bent and split into its constituent colors when it enters and exits the droplet.

2. **Identifying the Anti-Solar Point**:
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