precession

History Survival Guide is pulp-era inspired STEM and history blog that explores different engineer and scientific concepts with practical information about how to recreate by hand. This repo includes the relevant code or pngs behind any given guidebook page

A Python package to generate astronomy star charts that corrects for distortions with stereographic projection

A special design of planisphere for demonstrating the precession of the equinoxes.

celerity is a lightweight, zero-dependency, research-grade native Python astronomy library for precise astronomical calculations and observation planning, with IAU 2006/2000A precession, nutation and aberration models tested for milliarcsecond-level conformance against ERFA.

Cockpit web that computes your true astronomical sign — IAU 1930 constellations, equinox precession, Ophiuchus included. Cesium 3D scene, sidereal computation, live SGP4 orbital population.

Archaeoastronomy pipeline: 12,000 years of Regulus azimuth alignment at the Great Sphinx, computed from NASA Horizons ephemerides and Astropy precession. 8 epochs, 11,975 filtered alignment events.

Geocentric solar-system model and 3D simulator implementing the Expanding Solar System Resonance Theory — analytic, parametric, valid from start of solar system until J2000 +500 Myr

Precessing gravitational waveforms from inspiraling binary black holes in frequency domain.

Simulation to understand the working of gyroscope.

TerraFrame is a library designed to provided key Earth related calculations and associated functionality to modeling & simulation software. Primarily, TerraFrame provides Earth orientation and gravity routines.

An orbital simulation in an Earth-Centered Inertial frame — visualize planetary motion, precession, and day cycles with cinematic accuracy.

🔮 precession - Part of the Baudrillard Suite

code to generate inspiral gravitational waveforms from binary black holes, with the effects of gravitational lensing and regular precession, and to apply match-filtering analysis to study degeneracies between those two effects

Celestial Mechanics

Modern astronomy meets Chitra Paksha Ayanamsa / Lahiri Ayanamsa: GNSA is an independently derived Galactic nuclear-system ayanamsa, with GNSA-JP1 showing sub-arcsecond modern continuity over the tested modern period after J2000 phase binding.

An interactive digital armillary sphere (渾象) — visualizing the celestial sphere, the 28 Chinese lunar mansions, and axial precession across ±3000 years. Built with Three.js and astronomy-engine.

Pure Standard ML astronomical coordinate transforms: equatorial/ecliptic/horizontal/galactic frames, IAU 1976 precession, Bennett refraction, sidereal time (MLton + Poly/ML)

Rigid-body dynamics of a spinning gyroscope: steady precession under gravity, nutation, and torque-free tumbling.

Accurate positional astronomy with no dependencies: Sun, Moon, planets, precession, meteor showers, and a stereographic sky projection.

🌐 Explore the ECI Frame Geostatic Simulation to visualize Earth-Centered Inertial dynamics and enhance your understanding of geostatic effects.