▁Later ▁cel est ial ▁glob es ▁( G y up yo , ▁ 규 표 ) ▁were ▁att un ed ▁to ▁the ▁season al ▁variations . ▁ ▁The ▁a pe x ▁of ▁astronom ical ▁and ▁calendar ial ▁adv ances ▁under ▁King ▁Se j ong ▁was ▁the ▁Ch il je ongs an , ▁which ▁compiled ▁comput ations ▁of ▁the ▁courses ▁of ▁the ▁seven ▁heaven ly ▁objects ▁( five ▁visible ▁plan ets , ▁the ▁sun , ▁and ▁moon ), ▁developed ▁in ▁ 1 4 4 2 . ▁This ▁work ▁made ▁it ▁possible ▁for ▁scient ists ▁to ▁calculate ▁and ▁accur ately ▁predict ▁all ▁the ▁major ▁heaven ly ▁phen omena , ▁such ▁as ▁solar ▁e cli ps es ▁and ▁other ▁stell ar ▁movements . ▁Hon che ons ig ye ▁is ▁an ▁astronom ical ▁clock ▁created ▁by ▁Song ▁I - ye ong ▁in ▁ 1 6 6 9 . ▁The ▁clock ▁has ▁an ▁arm ill ary ▁sphere ▁with ▁a ▁diameter ▁of ▁ 4 0   cm . ▁The ▁sphere ▁is ▁activ ated ▁by ▁a ▁working ▁clock ▁mechanism , ▁showing ▁the ▁position ▁of ▁cel est ial ▁objects ▁at ▁any ▁given ▁time . ▁ ▁K ang n ido , ▁a ▁Korean - made ▁map ▁of ▁the ▁world ▁was ▁created ▁in ▁ 1 4 0 2 ▁by ▁Kim ▁Sa - h ye ong ▁( 김 사 형 , ▁ 金 士 <0xE8> <0xA1> <0xA1> ), ▁Y i ▁Mu ▁( 이 무 , ▁ 李 <0xE8> <0x8C> <0x82> ) ▁and ▁Y i ▁H oe ▁( 이 회 , ▁ 李 <0xE6> <0x92>