Here's why:

* Leo is a spring constellation. It's best visible in the Northern Hemisphere during the spring months, typically from March to June.

* Constellations shift across the sky throughout the year. Due to the Earth's rotation and orbit around the Sun, different constellations are visible at different times of the year.

* In January, Leo is located on the opposite side of the sky. Around January, Leo would be visible in the western sky after sunset, not the east.

To see Leo in the east, you would need to wait until the spring months.