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- Distance modulus calculator — m−M = 5 log10(d/10 pc) | CalcBE
Distance modulus formula: m−M = 5 log10(d/10 pc). Compute distance, apparent magnitude, or absolute magnitude, plus a simple 1/r² brightness graph.
- Kepler's third law (orbital period) calculator | CalcBE
Kepler's third law calculator: solve orbital period T or semi-major axis a, compare Solar System planets on an a–T chart, and view an orbit diagram — no sign-in.