constants.R

# Physical Constants for Astronomical Simulations
# All values in SI units unless otherwise specified

# Universal constants
G <- 6.6743015e-11  # Gravitational constant (m³/kg·s²)

# Masses (kg)
M_SUN <- 1.9885e30      # Mass of Sun
M_EARTH <- 5.972168e24  # Mass of Earth  
M_MOON <- 7.342e22      # Mass of Moon
M_MARS <- 6.39e23       # Mass of Mars
M_JUPITER <- 1.898e27   # Mass of Jupiter

# Distances (m)
AU <- 1.495978707e11    # Astronomical Unit (Earth-Sun distance)
R_EARTH <- 6.371e6      # Earth radius
R_MOON <- 1.737e6       # Moon radius
R_SUN <- 6.96e8         # Sun radius

# Time periods (seconds)
DAY <- 86400            # 1 day
YEAR <- 365.25 * DAY    # 1 year (including leap years)
LUNAR_MONTH <- 27.3 * DAY  # Sidereal month

# Velocities (m/s)
V_EARTH_ORBITAL <- 29780    # Earth's orbital velocity around Sun
V_MOON_ORBITAL <- 1022      # Moon's orbital velocity around Earth