/usr/share/proj/proj_def.dat is in proj-data 4.9.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | # Projection library defaults file
# SCCSID--- @(#)proj_def.dat 4.3 94/02/23 GIE REL"
# very preliminary version
<general>
ellps=WGS84
<>
<aea> # Conterminous U.S. map
lat_1=29.5
lat_2=45.5
<>
<lcc> # Conterminous U.S. map
lat_1=33
lat_2=45
<>
<lagrng>
W=2
<>
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