to observe the Sun, Moon, planets, comets and variable stars. He enriched the Observatory's library with many scientific books and journals. Some of them were donated by other European observatories. Schmidt also started editing the Publications of the Observatory of Athens.

During the 25 years of his work at the Athens Observatory, he performed more than 70,000 observations of variable stars and discovered several periodic variables and two Novae stars. Most of the results were published in the journal