He seems to have decided during this holiday to turn to astronomy, almost certainly influenced by the fact that at 78 years of age his father's health was failing and there was nobody else to continue his father's work.
Siya tila ay nagpasiyang sa panahon na ito holiday sa turn sa astronomy, halos tiyak naiimpluwensyahan ng ang katunayan na sa 78 taong gulang ang edad ng kanyang ama sa kalusugan ay nanghihina at doon ay walang tao pa na magpatuloy sa kanyang ama gawain.