This is a fun question that requires a little bit of math and understanding of scale! Here's how we can figure it out:

1. Get the Sizes:

* Sun's Diameter: 1,392,684 kilometers (865,000 miles)

* Moon's Diameter: 3,474 kilometers (2,159 miles)

2. Divide the Sun's Diameter by the Moon's Diameter:

1,392,684 kilometers / 3,474 kilometers = approximately 400

So, about 400 Moons could fit across the diameter of the Sun.

Important Note: This is a simplified calculation. We're assuming the Moons are lined up perfectly, touching each other, and that the sun is a perfect circle. In reality, it's a bit more complex!