You're looking for the brightest star visible in the southern sky from Phoenix, Arizona. That would be Sirius, the brightest star in the night sky.

Keep in mind that:

* Sirius is not directly overhead, but rather in the southern sky. You'll need to look south and a bit up to find it.

* The exact position of Sirius changes throughout the year. If you're looking for it in the winter, it will be higher in the sky, while in the summer it will be lower.

Let me know if you want to know more about Sirius or other stars!