Here's why:

* Earth's Orbit: The Earth orbits the Sun, causing the constellations we see to shift throughout the year.

* Leo's Visibility: Leo is a spring constellation. It's best visible in the Northern Hemisphere during the months of March and April.

* July's Sky: In July, the Earth is on the opposite side of its orbit, facing away from Leo. This means Leo is on the opposite side of the sky, near the setting sun in the west, and not visible in the east.

To see Leo, you'd need to look for it in the evening sky during the spring months.