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This chapter describes macros for the values of physical constants, such
as the speed of light, *c*, and gravitational constant, *G*.
The values are available in different unit systems, including the
standard MKSA system (meters, kilograms, seconds, amperes) and the CGSM
system (centimeters, grams, seconds, gauss), which is commonly used in
Astronomy.

The definitions of constants in the MKSA system are available in the file
`gsl_const_mksa.h`. The constants in the CGSM system are defined in
`gsl_const_cgsm.h`. Dimensionless constants, such as the fine
structure constant, which are pure numbers are defined in
`gsl_const_num.h`.

The full list of constants is described briefly below. Consult the header files themselves for the values of the constants used in the library.

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