astrolib-cpp

Data

Spherical Harmonics: EGM2008

https://earth-info.nga.mil/

Leap Seconds

https://data.iana.org/time-zones/data/leap-seconds.list

Nutation

https://hpiers.obspm.fr/eop-pc/models/models.html https://hpiers.obspm.fr/eoppc/bul/bulb/explanatory.html

IAU 1980

https://hpiers.obspm.fr/eop-pc/models/nutations/nut_IAU1980.dat

IERS 1996

https://iers-conventions.obspm.fr/content/chapter5/additional_info/tab5.3a.txt

Polar Motion

https://www.iers.org/IERS/EN/DataProducts/EarthOrientationData/eop https://datacenter.iers.org/data/latestVersion/EOP_C01_IAU1980_1846-now.txt

JPL EOP 2

https://eop2-external.jpl.nasa.gov/

IERS EOP C01 (IAU 1980 and IAU 2000)

https://datacenter.iers.org/data/latestVersion/EOP_C01_IAU1980_1846-now.txt

IERS EOP C04 (IAU 2000A)

https://datacenter.iers.org/data/latestVersion/EOP_20u24_C04_one_file_1962-now.txt