| calculate_sky_radiance | Sample Prague sky radiance at a chosen wavelength. |
| calculate_sky_values | Sample a direction from the Prague model. |
| calculate_sun_brightness | Sample sun luminance at the disk center. |
| clear_sky_data | Clear cached sky data files |
| download_sky_data | Download Prague Sky Model Coefficient Data |
| generate_moon_latlong | Generate the atmosphere with the moon |
| generate_planets | Generate a bright-planet image array |
| generate_sky | Generate a Hosek-Wilkie sky dome array |
| generate_sky_latlong | Generate a location and time-specific sky dome (optionally with stars) |
| generate_stars | Generate a star-field array aligned with 'generate_sky()' |
| list_sky_data | List cached sky data files |