HepublishedhiseditionofDeanalemmatein1562togetherwithacommentaryonthetextandaworkhisownOnthecalibrationofsundialsofwhichhefeltaddedapracticalaspecttoPtolemy'stheoreticaldiscussions.

Please segment the words.
He published his edition of De analemmate in 1562 together with a commentary on the text and a work his own On the calibration of sundials of which he felt added a practical aspect to Ptolemy 's theoretical discussions.