Original: Palomar Observatory [ ] is a privately owned observatory located in San Diego County , California , 90 miles ( 145 km ) southeast of Pasadena 's Mount Wilson Observatory , on Palomar Mountain in the Palomar Mountain Range .
Simplified: Palomar Observatory is a privately owned observatory in San Diego County , California , 90 miles ( 145 km ) southeast of Mount Wilson Observatory , on Palomar Mountain in the Palomar Mountain Range .