You're close to the right idea, but the answer isn't as simple as the distance between *our* eyes. When measuring stellar parallaxes, we don't use our own eyes. Instead, we use the diameter of the Earth's orbit as the baseline for our measurements.

Here's why:

* Parallax is the apparent shift in the position of a distant object when viewed from two different locations. The greater the distance between those locations, the larger the parallax angle.

* Stellar parallax refers to measuring the apparent shift in the position of a star against the background of distant stars when observed from opposite sides of the Earth's orbit.

* Earth's orbit's diameter provides the largest possible baseline we can use for measuring stellar parallax, which is why it is used.

So, instead of the distance between our eyes, we use the distance between two points on Earth's orbit (roughly 186 million miles, or 300 million kilometers) to calculate the parallax angle and thus the distance to the star.