npdatetime 0.2.4

Astronomical calculator for Bikram Sambat calendar based on solar and lunar positions. High-performance Nepali (Bikram Sambat) datetime library with multi-language bindings
Documentation 
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//! Core utilities for astronomical calculations
//!
//! Handles time conversion, constants, and root finding

pub mod constants;
pub mod newton_raphson;
pub mod time;

pub use newton_raphson::NewtonRaphsonSolver;
pub use time::JulianDay;

/// Zodiac signs
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum ZodiacSign {
    Aries = 0,       // Mesh (बैशाख)
    Taurus = 1,      // Vrishabha (जेष्ठ)
    Gemini = 2,      // Mithuna (आषाढ)
    Cancer = 3,      // Karka (श्रावण)
    Leo = 4,         // Simha (भाद्र)
    Virgo = 5,       // Kanya (आश्विन)
    Libra = 6,       // Tula (कार्तिक)
    Scorpio = 7,     // Vrishchika (मंसिर)
    Sagittarius = 8, // Dhanu (पौष)
    Capricorn = 9,   // Makara (माघ)
    Aquarius = 10,   // Kumbha (फाल्गुन)
    Pisces = 11,     // Meena (चैत्र)
}

impl ZodiacSign {
    /// Get longitude where this sign starts (in degrees)
    pub fn start_longitude(&self) -> f64 {
        (*self as u8 as f64) * 30.0
    }

    /// Get BS month corresponding to this zodiac sign
    pub fn to_bs_month(&self) -> u8 {
        (*self as u8 + 1) % 12 + 1
    }
}