The plate archive

Demo note — delete me. I exist so The graticule has something to link to — check my margin for the backlink count.

Harvard’s plate stacks hold half a million glass photographs of the sky, annotated in ink by the computers who measured them. A notebook is the same instrument at personal scale: expose, annotate, file, revisit.

Inline math also works: the Hubble rate is $H(z) = H_0 \sqrt{\Omega_m (1+z)^3 + \Omega_\Lambda}$, set in KaTeX with variables italic and everything else upright — as it should be.