twilight2angle

internal

Definitions of classes, methods, operators and functions for use in
    'photobiology' and radiation meteorology and climatology. Calculation of
    effective (weighted) and not-weighted 'irradiances'/doses, 'fluence' rates,
    'transmittance', 'reflectance', 'absorptance', 'absorbance' and diverse
    ratios and other derived quantities from spectral data. Local 'maxima' and
    'minima'. Conversion between energy- and photon-based units. Wavelength
    interpolation. Astronomical calculations related solar angles and day
    length. Colours and vision.

twilight2angle: twilight argument check and conversion

Description

Usage

Arguments

Value