Air mass and refraction
Andrew T. Young. Applied Optics 33(6), 1994, 1108-1110.
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A refinement of the airmass approximation in kasten-young-1989: gives a formula for relative optical air mass as a function of true geometric zenith angle rather than the refracted (apparent) angle, still valid to the horizon. This is the more directly applicable of the two where a renderer already knows a star's true unrefracted zenith angle (as computed from geometry, before any atmospheric-refraction correction is applied). Bibliographic details verified against the publisher record at opg.optica.org (Optica Publishing Group); the DOI resolves.
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