/usr/share/libswe/ephe/seleapsec.txt is in swe-basic-data 1.80.00.0002-1.
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 | # This file contains the dates of leap seconds to be taken into account
# by the Swiss Ephemeris.
# For each new leap second add the date of its insertion in the format
# yyyymmdd, e.g. "20081231" for 21 december 2008
20081231
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