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Attempting to use libnova 0.15.0 near the poles, I get many anomalous outputs from ln_get_solar_rst(). Generally, I get rise/transit/set times that do not occur in order. My expectation is that rise/transit/set should be in order increasing in time.

Please see example code and output attached.

$ uname -a
Linux incursion 5.13.0-30-generic #33-Ubuntu SMP Fri Feb 4 17:03:31 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

(cd libnova-0.15.0/src; gcc -c .c -I.)
ar r libnova.a libnova-0.15.0/src/.o
gcc -g -Wall -Ofast tester.c libnova.a -I libnova-0.15.0/src -lm -o tester