Martinus Hortensius

Martin (Maarten) van den Hove (Latinized as Martinus Hortensius (Ortensius)) (1605 – 7 August 1639) was a Dutch astronomer and mathematician. His adopted Latin name is a translation of the Dutch hof ("garden"), in Latin horta.

Born in Delft, he studied at Leiden University under Snellius and Isaac Beeckman from 1625 to 1627. He received further instruction from Snellius from 1628 to 1630 at Leiden and at Ghent.

In 1628, he began studying under Philippe van Lansberge, who was introduced to him by Beeckman. Van den Hove became an enthusiastic supporter of Landsberge, who was by now quite aged, and helped Landsberge complete his project to "restore astronomy" (i.e. create new systematic observations to replace old, insufficient data). Landsberge thanked Van den Hove publicly, considered himself lucky that "by divine providence, in my old age, pressed by sickness, such a strong helper came to my aid, as formerly the learned Rheticus to the great Copernicus."

In 1632, at Copenhagen (Hafnia in Latin) and later reprinted at London in 1696, Petrus Bartholin published Apologia pro observationibus, et hypothesibus...Tycho Brahe...Contra...Martini Hortensii Delfensis criminationes et calumnies, quas in praefationem commentationum praeceptoris sui Philippi Lansbergii Middelburgensis, de motu terrae diurno et annuo etc. cosarcinnavit ("Defense of the Astronomical Observations and Theses of Tycho Brahe against the accusations and false claims of Martinus Hortensius of Delft, which appear in his preface of the commentary by his teacher Philip van Landsberge, who wrote on the daily and annual motion of the earth"). Van den Hove had attacked many of Tycho Brahe's claims in his preface to his Latin translation of a work by Landsbergen. This was the Commentationes in motum terrae diurnum, & annuum (Middelburg, 1630). The first Latin edition of Landsberge's illustrated treatise, the Commentationes taught the probability of earth’s motion according to the Copernican theory. Van den Hove regarded Landsberge, not Tycho Brahe, as the one who was restoring astronomy. "Only Landsberge held all ancient observations in esteem," Van den Hove wrote, "whereas Tycho, Longomontanus, and Kepler tended to neglect them."

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