Probably, the most outstanding feature of Kiyai Zuhri was his ability to calculate the movement of the sun and moon, and thus managed to determine in advance the date for Ramadan and Syawal. It was not known that others had this knowledge beside him.
Thus, he contributed regularly to the newspapers, informing Muslims when Ramadan and Syawal will fall that year. However, the final decision on the dates will be determined by the Mufti, and Kiyai Zuhri always followed the Mufti’s decision.
It was his love for astronomy that he would bring his children out to gaze the night sky, pointing to them the different constellations and told them the facts about stars, that they were far and huge.