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-@node Macros
-@chapter Macros
-
-@file{<libred.h>} defines a small set of macros
-suitable for using a @code{#if} preprocessing directives.
-
-@table @code
-@item LIBRED_IS_TWILIGHT(const double)
-Evaluates to 1 if the given expression is between @math{-18.0}
-and 0.0 (this is, between
-@code{LIBRED_SOLAR_ELEVATION_ASTRONOMICAL_DUSK_DAWN} and
-@code{LIBRED_SOLAR_ELEVATION_SUNSET_SUNRISE}), inclusively,
-otherwise, this macro evaluates to 0. The input should be
-the Sun's apparent elevation, and the macro evaluates to 1
-if it is currently twilight. The given expression is evaluted
-either once or twice, therefore, it must not have side-effects.
-
-@item LIBRED_IS_CIVIL_TWILIGHT(const double)
-Evaluates to 1 if the given expression is between @math{-6.0}
-and 0.0 (this is, between
-@code{LIBRED_SOLAR_ELEVATION_CIVIL_DUSK_DAWN} and
-@code{LIBRED_SOLAR_ELEVATION_SUNSET_SUNRISE}), inclusively,
-otherwise, this macro evaluates to 0. The input should be
-the Sun's apparent elevation, and the macro evaluates to 1
-if it is currently civil twilight. The given expression is
-evaluted either once or twice, therefore, it must not have
-side-effects.
-
-@item LIBRED_IS_NAUTICAL_TWILIGHT(const double)
-Evaluates to 1 if the given expression is between @math{-12.0}
-and @math{-6.0} (this is, between
-@code{LIBRED_SOLAR_ELEVATION_NAUTICAL_DUSK_DAWN} and
-@code{LIBRED_SOLAR_ELEVATION_CIVIL_DUSK_DAWN}), inclusively,
-otherwise, this macro evaluates to 0. The input should be the
-Sun's apparent elevation, and the macro evaluates to 1 if it
-is currently nautical twilight. The given expression is evaluted
-either once or twice, therefore, it must not have side-effects.
-
-@item LIBRED_IS_ASTRONOMICAL_TWILIGHT(const double)
-Evaluates to 1 if the given expression is between @math{-18.0}
-and @math{-12.0} (this is, between
-@code{LIBRED_SOLAR_ELEVATION_ASTRONOMICAL_DUSK_DAWN} and
-@code{LIBRED_SOLAR_ELEVATION_NAUTICAL_DUSK_DAWN}), inclusively,
-otherwise, this macro evaluates to 0. The input should be the
-Sun's apparent elevation, and the macro evaluates to 1 if it is
-currently astronomical twilight. The given expression is evaluted
-either once or twice, therefore, it must not have side-effects.
-@end table
-