Integrating the first light paths…
Kerr–Schild study / 02
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A spacetime observatory
The Last Clock
A little light, a great deal of gravity, and one last clock keeping watch at the edge of forever.
Light paths numerically integrate the null-geodesic Hamiltonian in horizon-penetrating Kerr–Schild coordinates. Disk brightness includes relativistic frequency shifting; color and the plunging-region heat contours are an inward velocity/temperature approximation. Visible light only uses exposure-normalized thermal-spectrum samples; the contour overlay remains available in either spectrum mode. It does not predict absolute luminosity. Indirect images are classified by accumulated ray bending and coverage-reduced as their photon subrings become unresolved. The grid, probe marker, and horizon interior are explanatory views.