French astronomer Benjamin Valz was born #OTD in 1787.
He had a particular interest in comets, his observations including that of Biela’s Comet made in 1846 in which he noted that the comet had split into two parts. He is also remembered for his suggestion that observed irregularities in the orbit of Halley’s Comet may have been due to the gravitational effects of an as-yet unknown planet orbiting the Sun beyond Uranus which was at a time prior to the discovery of Neptune.