/usr/share/celestia/shaders/ is in celestia-common 1.6.1+dfsg-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/celestia/shaders/bumpdiffuse.vp
/usr/share/celestia/shaders/bumpdiffuse_arb.vp
/usr/share/celestia/shaders/bumpdiffuse_arb_hdr.vp
/usr/share/celestia/shaders/bumpdiffuse_nv.fp
/usr/share/celestia/shaders/bumphaze.vp
/usr/share/celestia/shaders/bumphaze_arb.vp
/usr/share/celestia/shaders/bumphaze_arb_hdr.vp
/usr/share/celestia/shaders/diffuse.vp
/usr/share/celestia/shaders/diffuse2_arb.vp
/usr/share/celestia/shaders/diffuse_arb.vp
/usr/share/celestia/shaders/diffuse_nv.fp
/usr/share/celestia/shaders/diffuse_texoff.vp
/usr/share/celestia/shaders/diffuse_texoff2_arb.vp
/usr/share/celestia/shaders/diffuse_texoff_arb.vp
/usr/share/celestia/shaders/eclipse1_nv.fp
/usr/share/celestia/shaders/eclipse2_nv.fp
/usr/share/celestia/shaders/ell_galaxy_arb.vp
/usr/share/celestia/shaders/glossmap_arb.vp
/usr/share/celestia/shaders/haze.vp
/usr/share/celestia/shaders/haze2_arb.vp
/usr/share/celestia/shaders/haze_arb.vp
/usr/share/celestia/shaders/multishadow_arb.vp
/usr/share/celestia/shaders/night.vp
/usr/share/celestia/shaders/night2_arb.vp
/usr/share/celestia/shaders/night2_arb_hdr.vp
/usr/share/celestia/shaders/night_arb.vp
/usr/share/celestia/shaders/night_arb_hdr.vp
/usr/share/celestia/shaders/rings.vp
/usr/share/celestia/shaders/rings_arb.vp
/usr/share/celestia/shaders/ringshadow.vp
/usr/share/celestia/shaders/ringshadow_arb.vp
/usr/share/celestia/shaders/shadow_on_rings_nv.fp
/usr/share/celestia/shaders/shadowtex.vp
/usr/share/celestia/shaders/shadowtex_arb.vp
/usr/share/celestia/shaders/simple.vp
/usr/share/celestia/shaders/simple_arb.vp
/usr/share/celestia/shaders/specular.vp
/usr/share/celestia/shaders/specular2_arb.vp
/usr/share/celestia/shaders/specular_arb.vp
/usr/share/celestia/shaders/star_arb.vp
/usr/share/celestia/shaders/texphong_alpha_arb.vp
/usr/share/celestia/shaders/texphong_alpha_nv.fp
/usr/share/celestia/shaders/texphong_arb.vp
/usr/share/celestia/shaders/texphong_nv.fp