These older Neujahrsgaben are available:
De coni sectionibus / Über die Kegelschnitte
Latin and German
Edited and translated by Thomas Dittert
62 pages, paper binding, thread stitching • 12,00 €
Kepler was the first mathematician to discuss the hyperbola, the parabola, the ellipse, and the circle as curves transforming continuously from one into another.
„Kepler's invention of points at infinity made it possible to regard the projective plane as the affine plane plus the line at infinity." H.S.M. Coxeter
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The series of Neujahrsgaben will be continued in the future (from New Year 2024 on).