TY - JOUR A1 - Vollmer, Michael A1 - Gedzelman, S. D. T1 - Colors of the sun and moon : the role of the optical air mass T2 - In: European journal of physics 27 (2006), 299-309 N2 - A geometric model for the optical air mass of the atmosphere is developed. Using the model, simple formulae are derived for the optical thickness of light passing through (1) a molecular atmosphere, (2) an atmosphere with uniformly distributed tropospheric aerosols and (3) atmospheres with elevated aerosol layers. The formulae are used to model the spectra and perceived colours of the Sun and Moon. Y1 - 2013 UR - https://opus4.kobv.de/opus4-fhbrb/frontdoor/index/index/docId/415 SP - 299 EP - 309 ER -