He was elected to the National Academy of Sciences (United States) in April 1877 and published the results of his earlier research in astronomy in a book Photometric Researches (1878).
Siya ay elected sa National Academy of Sciences (Pilipinas) sa April 1877 at nai-publish ang mga resulta ng kanyang mga naunang pananaliksik sa astronomy, sa isang libro potometrik pananaliksik (1878).