Acknowledgments

Mathematical Foundation

solarsystem by Ioannis Nasios — The pure Python astronomy library that inspired and served as the mathematical foundation for Ketu’s NumPy ephemeris engine. Kepler’s equation solver, perturbation terms, coordinate transformations, and Moon calculations all trace back to this elegant, dependency-free library. Thank you!

Collaboration

Claude by Anthropic — The pure NumPy rewrite, from orbital mechanics to aspect detection, was developed in collaboration with Claude. Architecture, algorithms, tests, and documentation were produced through extensive pair programming sessions. This collaboration continued through v1.1 (configurable aspects, house systems), v1.2 (charts, synastry, composite, returns, Arabic Parts), and v1.3 (Chiron Chebyshev engine).

Workflow

GSD (Get Shit Done) — The project management workflow that structured the development of Ketu into phases with research, planning, execution, and verification steps. Used throughout v1.0 through v1.3.

Other Influences

  • Original orbital calculations based on Paul Schlyter’s work

  • Inspired by the accuracy and reliability of Swiss Ephemeris

  • Orb system based on Abu Ma’shar (787-886) and Al-Biruni (973-1050)

  • Built with the power of NumPy for scientific computing