Here is a list of all files with brief descriptions:

[detail level 12]

datasets
airports.h
all.h	Includes the header files of all datasets (for convenience)
astronomy.h	Includes the header files of all astronomy datasets (for convenience)
chemical_elements.h	Contains the dataset from chemical_elements.csv
Earth.h	Contains data of our Earth, e.g. Earth.mass
exoplanets.h	Contains the dataset from exoplanets.csv
ISO216.h	Contains ISO 216: The international standard for paper sizes
ISO668.h	Contains ISO 668: Series 1 freight containers
lithium_battery_materials.h	Contains the dataset from lithium_battery_materials.csv
material_properties.h	Contains the dataset from material_properties.csv
monthly_sunspots.h	Contains the dataset from monthly_sunspots.csv
Moon.h	Contains data of our Moon, e.g. Moon.mass
moons.h	Contains the dataset from moons.csv
musical_notes.h	Contains the dataset from musical_notes.csv
physics_particles.h	Contains the dataset from physics_particles.csv
planets.h	Contains the dataset from planets.csv
examples
astronomy.cpp	Provides 13 astronomy examples using libSI
conversions.cpp	Provides 7 import/export examples
main.cpp	The main() function calling all other example functions
speeds.cpp	Provides 5 speed examples using libSI
various.cpp	Provides 34 various examples using libSI
SI
constants.h	Defines 77 type-safe constants, e.g. speed_of_light_in_vacuum
conversions.h	Defines conversion functions, e.g. to_string(12_m)
core.h	Includes the 6 core header files (for convenience)
datatypes.h	Defines the dimensionless, the SI base, and the derived SI datatypes, e.g. SI::length
formulas.h	Defines 77 formulas based on SI datatypes, e.g. SI::formula::wavelength()
internal.h	Internal header file (providing datatypes, classes, etc.)
literals.h	Defines 297 literals, e.g. 24_h
prefixes.h	Defines the 24 SI prefixes
print.h	Defines simple print() and println() templates (similar to C++23)
tests.h	Contains 210 unit tests at compile-time to verify everything
units.h	Defines 103 type-safe units, e.g. SI::meters