He was widely acquainted with practical astronomy, invented many valuable astronomical instruments, and improved others.

Goethals remained at the military academy during the summer and fall of 1880 as an assistant instructor in practical astronomy.

For Rees's Cyclopaedia he contributed 63 articles on practical astronomy.

Such works are characterized by the fact that they are compilations of computational methods of practical astronomy.

In 1760 Alexander Wilson was installed as professor of practical astronomy.

These material aids, together with a dutiful sense of filial obligation, decided him to make practical astronomy the main work of his life.

In practical astronomy Jewish work was even more effective.

As the inventor of the floating collimator, Kater rendered a service to practical astronomy.

William Chauvenet: A manual of spherical and practical astronomy.

He was finally appointed "director for practical astronomy" at Göttingen in 1868.