what does the word "RASAD-GAAH" [رصد گاہ] MEAN?

Re: what does the word “RASAD-GAAH” رصد گاہ] MEAN?

vo rasad seen se hogaa…suaad waalaa rasad bahot rare hai aur shaa’irii meN to aur bhii ziyaada rare haiN…aajkal ke zamaane ke sho’araa ko shaayad is lafz kaa pataa bhii na ho.