ac ▁had ▁an ▁extra ▁sub title ▁which ▁was ▁not ▁util ised ▁in ▁later ▁ed itions : ▁the ▁really ▁useful ▁guide ▁to ▁the ▁w onders ▁of ▁the ▁night ▁sky . ▁ ▁It ▁had ▁been ▁preced ed ▁by ▁Astronom ical ▁Data ▁( 1 9 6 5 – 1 9 9 0 ) ▁and ▁the ▁Astronom ical ▁Hand book ▁( 1 9 8 9 – 1 9 9 2 ▁? ). ▁ ▁Per th ▁Observ atory ▁today ▁The ▁Minor ▁Planet ▁Center ▁cred its ▁ 2 9 ▁minor ▁planet ▁discover ies ▁to ▁Per th ▁Observ atory ▁for ▁the ▁period ▁between ▁ 1 9 7 0 ▁and ▁ 1 9 9 9 . ▁ ▁On ▁ 2 2 ▁January ▁ 2 0 1 3 ▁the ▁W A ▁Government ▁announced ▁that ▁all ▁research ▁programs ▁would ▁be ▁cut ▁and ▁the ▁Observ atory ▁would ▁only ▁be ▁open ▁for ▁t ours . ▁ ▁As ▁of ▁the ▁ 1 st ▁of ▁July ▁ 2 0 1 5 , ▁the ▁Per th ▁Observ atory ▁Vol unte er ▁Group ▁has ▁been ▁running ▁the ▁Observ atory ▁for ▁the ▁Western ▁Australian ▁Government , ▁The ▁Per th ▁Observ atory ▁continues ▁to ▁operate ▁today ▁under ▁the ▁management ▁of ▁only ▁ 3 ▁part - time ▁staff ▁and ▁almost ▁ 1 2 0 ▁passion ate ▁volunte ers ▁who ▁work ▁hard ▁ensure ▁its ▁position ▁as ▁a ▁scientific ▁and ▁her itage ▁education ▁facility . ▁ ▁Each ▁year ▁more ▁than ▁ 2 0 0 ▁events ▁are ▁hosted ▁at ▁the ▁Observ atory ▁which ▁draw ▁over ▁ 1 0 , 0 0 0 ▁visitors . ▁Further