He has contributed to numerous research papers in observational planetary astronomy.

A century later Americans seem equally indifferent to planetary astronomy as well as to other sciences and mathematics.

The perspective of planetary astronomy, which alone enables us to view a planet as a whole, seems to be good training for studies of the earth.

This degree of accuracy was attained in European planetary astronomy only in modern times.

Rare Earth hypothesis, a hypothesis in planetary astronomy and astrobiology.

This is especially important in planetary astronomy.

It is named for astronomer Brett Gladman in recognition of his contributions to planetary astronomy.

My own field of specialization is planetary astronomy.

His main scientific interest were the Sun and its eclipses, planetary astronomy, zodiacal light.

Fitch has worked with relativity, planetary astronomy, computer algebra and Lisp.