Unfortunately, his observations have not survived: they were lost in the great Copenhagen Fire of 1728.
Δυστυχώς, οι παρατηρήσεις του αυτές δεν διασώθηκαν, καθώς χάθηκαν στη μεγάλη Πυρκαγιά της Κοπεγχάγης του 1728.