▁was ▁completed ▁in ▁ 1 3 6 4 ▁by ▁Giovanni ▁de ' ▁D ond i ▁( 1 3 1 8 – 1 3 8 8 ), ▁a ▁scholar ▁and ▁phys ician ▁of ▁the ▁Middle ▁A ges ▁interested ▁in ▁astronom y ▁and ▁hor ology . ▁The ▁original ▁clock , ▁consisting ▁of ▁ 1 0 7 ▁whe els ▁and ▁pin ions , ▁has ▁been ▁lost , ▁perhaps ▁during ▁the ▁s ack ing ▁of ▁Mant ua ▁in ▁ 1 6 3 0 , ▁but ▁de ' ▁D ond i ▁left ▁detailed ▁descri ptions ▁which ▁have ▁surv ived , ▁en abling ▁a ▁reconst ruction ▁of ▁the ▁clock . ▁It ▁displays ▁the ▁mean ▁time , ▁sid ere al , ▁( or ▁star ), ▁time ▁and ▁the ▁mot ions ▁of ▁the ▁sun , ▁moon ▁and ▁the ▁five ▁then - known ▁plan ets ▁Ven us , ▁Mars , ▁Sat urn , ▁Mercur y , ▁and ▁Jup iter . ▁It ▁was ▁conce ived ▁according ▁to ▁a ▁P to le ma ic ▁conception ▁of ▁the ▁solar ▁system . ▁De ' ▁D ond i ▁was ▁inspired ▁by ▁his ▁father ▁Jac opo ▁who ▁designed ▁the ▁astronom ical ▁clock ▁in ▁the ▁Pia z zi ▁dei ▁Sign ori , ▁Pad ua , ▁in ▁ 1 3 4 4 ▁– ▁one ▁of ▁the ▁first ▁of ▁its ▁type . ▁ ▁In ▁later ▁ages ▁more ▁astr aria ▁were ▁built . ▁A ▁famous ▁example ▁is ▁the ▁E ise ▁E ising a ▁Planet arium ▁built ▁in ▁ 1 7 7 4 ▁by ▁E ise ▁E ising a ▁from ▁D ron rij