FrameCalc
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General relativity

Metrics, redshift, orbits, and horizons

Schwarzschild radius

r_s = 2GM/c²

Gravitational redshift

ν′/ν near mass

GR time dilation

Clock rate vs r

Photon sphere

r = 1.5 r_s

ISCO radius

r_ISCO = 6M

Circular orbit Ω

Kepler-like GR Ω

Light deflection

δφ ≈ 4GM/bc²

FLRW scale sketch

a(t) matter/Λ

Effective potential sketch

V²_eff Schwarzschild

FrameCalc

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