Metadata-Version: 2.4
Name: caltib
Version: 0.3.2
Summary: Tibetan calendar toolkit (traditional + reform engines).
Author: caltib contributors
License: MIT License
        
        Copyright (c) 2026 Tsogtgerel Gantumur
        
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License-File: LICENSE
Requires-Python: >=3.9
Provides-Extra: dev
Requires-Dist: build>=1.2; extra == 'dev'
Requires-Dist: mypy>=1.8; extra == 'dev'
Requires-Dist: pytest>=8; extra == 'dev'
Requires-Dist: ruff>=0.4; extra == 'dev'
Requires-Dist: twine>=5; extra == 'dev'
Provides-Extra: ephemeris
Requires-Dist: jplephem>=2.21; extra == 'ephemeris'
Requires-Dist: skyfield>=1.45; extra == 'ephemeris'
Provides-Extra: full
Requires-Dist: jplephem>=2.21; extra == 'full'
Requires-Dist: matplotlib>=3.8; extra == 'full'
Requires-Dist: numpy>=1.24; extra == 'full'
Requires-Dist: scipy>=1.10; extra == 'full'
Requires-Dist: skyfield>=1.45; extra == 'full'
Provides-Extra: tools
Requires-Dist: matplotlib>=3.8; extra == 'tools'
Requires-Dist: numpy>=1.24; extra == 'tools'
Requires-Dist: scipy>=1.10; extra == 'tools'
Description-Content-Type: text/markdown

# caltib
**High-Precision Tibetan Calendrical Math**

`caltib` is a rigorous Python library designed to unify 15th-century historical algorithms with 21st-century astrophysics. It provides a polymorphic framework for evaluating traditional lunisolar calendars alongside modern mathematical reforms.

### Live Demonstration
The library can be evaluated directly in the browser without local installation. The web calendar runs completely client-side via WebAssembly:
👉 **[Launch the caltib Web App](https://gantemur.github.io/caltib/app.html)**

---

## Key Features

* **Unified API:** Evaluate traditional engines (Phugpa, Mongol, Tsurphu, etc.) and modern reforms (L0–L6) using a single, harmonized interface.
* **Progressive Reforms:** A tiered sequence of engines advancing from pure-integer mean motion (L0) and fixed-iteration Picard solvers (L1–L3) to strictly reproducible floating-point models (L4–L5) and JPL-powered numerical integration (L6).
* **Strict Reproducibility:** L0–L5 engines utilize integer sine-tables or Chebyshev minimax polynomials to ensure bit-for-bit consistency across all CPU architectures.
* **Localized Physics:** Support for geographical location injection to accurately handle spherical sunrise boundaries and civil day-numbering conventions.
* **Design & Diagnostics Laboratory:** A professional-grade toolkit for designing new calendar parameters via continued fractions and analyzing secular drift over millennia.

---

## Installation

`caltib` is designed to be lightweight. The core package has zero external dependencies, making it highly suitable for embedded environments or web deployment.

**Core: Traditional engines & Reform Tiers L0-L5**
```bash
pip install caltib
```

**Tools: Diagnostic charting & parameter design** *(requires NumPy & Matplotlib)*
```bash
pip install "caltib[tools]"
```

**Ephemeris: JPL DE422 integration & L6 engine** *(requires Skyfield & jplephem)*
```bash
pip install "caltib[ephemeris]"
```

---

## Quickstart

### Basic Day Query
```python
from datetime import date
import caltib

# Standard traditional lookup
info = caltib.day_info(date(2026, 2, 21), engine="mongol")
print(f"Mongol Tithi: {info.tibetan.tithi}")
```

### Advanced Localized Reform
```python
from caltib.engines.specs import LOC_MONTREAL
import caltib

# Build an L3 engine localized to Montreal coordinates.
# L3 utilizes fixed-iteration rational Picard solvers and spherical sunrise geometry.
engine = caltib.get_calendar("l3", location=LOC_MONTREAL)
info = engine.day_info(date(2026, 2, 21))
```

---

## Diagnostics & Design

The library includes a comprehensive diagnostic suite to rigorously analyze calendar accuracy and historical deviations.
* **Secular Drift:** Track how sidereal calendars decouple from the tropical equinox over 1,500-year timescales.
* **Variance Mapping:** Visualize the error propagation and variance of traditional anomaly approximations.
* **Rational Design:** Derive optimal convergents for constructing new calendar architectures.

**Example Usage:**
```bash
# Analyze secular acceleration against JPL DE422 numerical integration
caltib diag analysis --engine mongol --ephem de422
```

---
**License:** Distributed under the MIT License. Created by Tsogtgerel Gantumur.