Astrophysics & Astronomy
Advanced astrophysical calculations for orbital mechanics, stellar evolution, cosmology, and celestial dynamics.
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Orbital Period Calculator
Calculate orbital period using Kepler's laws. Find orbital velocity, angular velocity, and perihelion/aphelion distances.
Escape Velocity Calculator
Calculate escape velocity, orbital velocity, and gravitational parameters for celestial bodies.
Stellar Luminosity Calculator
Calculate stellar luminosity using Stefan-Boltzmann law. Find absolute magnitude, main sequence lifetime, and stellar parameters.
Redshift Calculator
Calculate cosmological redshift, recessional velocity, distance, and lookback time using Hubble's law.
Black Hole Event Horizon Calculator
Calculate Schwarzschild radius, event horizon, ergosphere, Hawking temperature, and black hole parameters.
Planetary Transit Calculator
Calculate transit depth, duration, probability, and timing for exoplanet transits.
Stellar Mass Calculator
Calculate stellar mass using mass-luminosity relation, mass-radius relation, and orbital dynamics.
Cosmological Distance Calculator
Calculate luminosity distance, comoving distance, angular diameter distance, and lookback time using cosmological models.
Tidal Force Calculator
Calculate tidal forces, Roche limit, Hill sphere, and tidal locking timescales for celestial bodies.
Roche Limit Calculator
Calculate Roche limit - the minimum distance a satellite can orbit before being torn apart by tidal forces.
Stellar Physics Calculator
Complete stellar physics calculations. Analyze luminosity, temperature, nuclear fusion, stellar evolution, black body radiation, and stellar distances.
Orbital Mechanics Calculator
Complete orbital mechanics calculations. Kepler's laws, Hohmann transfers, delta-v, Lagrange points, escape velocities, and relativistic effects.
Cosmology Suite Calculator
Complete cosmology calculations. Hubble's law, cosmic distances, Big Bang timeline, dark matter/energy, CMB analysis, and black hole physics.
Escape Velocity
v_esc = √(2GM/R) from mass and radius.
Planck Bλ
Blackbody spectral radiance per unit wavelength (SI).
Stefan–Boltzmann
P = εσAT⁴.
Hubble Time
Order-of-magnitude Hubble time 1/H0 from H₀ in km/s/Mpc.
Drake Equation
N = R⋅fp⋅ne⋅fl⋅fi⋅fc⋅L (your parameter guesses).