Daniel Santbech
Daniel Santbech was a Dutch astronomer and mathematician of the 16th century.
Life
Since he used the Latinized name Novimagus, he perhaps came from Nijmegen. Maybe he studied in Basel.
In 1561 he published a work in Basel with a treatise on trigonometry and sine tables of Regiomontanus ( De triangulis Planis et libri quinque sphaericis, Compositio Tabularum sinum recto ) and his own treatise Problematum astronomicorum et geometricorum. This publication deals with astronomical tasks ( he follows Ptolemy, but also quotes Nicolaus Copernicus ), such as measuring the time for the stars, sundials and construction of a quadrant, calendar issues, land surveying tasks, information for navigation and cartographers and the calculation of trajectories ( ballistics ), where he approaches the web through a right-angled triangle. This corresponded to the Aristotelian separation of natural (normal case, motus naturalis ) and by the urging force of the charge of forced movement (straight longitudinal alignment of the cannon, motus violentus ) and he assumed that the length of the forced trajectory is independent of the inclination of the cannon equal and can be determined by a single shot, so that the firing range varies with the cosine of the inclination angle of the cannon. The largest range of fire arose thereafter (as opposed to experience) with horizontal shot. The writings of Niccolo Tartaglia (La Nova Scientia 1537 ) to ballistics, in which he also approaches the trajectory with a circular curve and indicates the shot angle of 45 degrees as the maximum firing range, he apparently did not know.
The cosine dependence of the range of fire also took Rivaltius (David Rivault de Fleurance, 1571-1616 ), in his book on artillery (Les elements de l' artillery, Paris 1605 ) that likely derived from Santbech.
Although he cited Copernicus, however, was no sooner Copernican in the Netherlands - the different conception of Ptolemy and Copernicus on the motion of the earth is not addressed.
A lunar crater is named after him ( by Giovanni Riccioli 1651).
Writings
- Problemata Astronomica et Geometrica, 1561, Online