Kepler's laws of planetary motion law" is what became the Second Law in the set of three; but Kepler did himself not privilege it in that way. Johannes Kepler published his first two laws about planetary motion in 1609, having found them by analyzing the astronomical observations of Tycho Brahe. Kepler's third law was published in 1619. Kepler had believed in the Copernican model of the solar system, which called for circular orbits, but he could not reconcile Brahe's highly precise observations with a circular fit to Mars' orbit—Mars coincidentally having the highest eccentricity of all planets except Mercury. His first law reflected this discovery.
Observations (Pierre Belon) rerum ... observationes". The Latin text was reprinted as an appendix to Clusius's "Exoticorum libri decem" (1605). Observations (Pierre Belon) Les observations de plusieurs singularitez et choses memorables trouvées en Grèce, Asie, Judée, Egypte, Arabie et autres pays estranges is a work of ethnographical, botanical and zoological exploration by Pierre Belon (1517–1564), a French naturalist from Le Mans. Starting in 1546, Belon travelled through Greece, Asia Minor, Egypt, Arabia and Palestine, returning to France in 1549. His "Observations", with illustrations, were first published in 1553. A second edition appeared in 1555. The work was translated into Latin by Charles de