Literatur
- Faid, M. S. et al. (2024): Alteration of twilight sky brightness profile by light pollution, Sci Rep, 14, 26682
- Crumey A. (2014): Human contrast threshold and astronomical visibility, Monthly Notices of the Royal Astronomical Society, 442, 2600
- Belokrylov, R., Belokrylov, S. & Nickiforov, M. (2011): Model of the stellar visibility during twilight, Bulgarian Astronomical Journal, 16, 50 (via Researchgate)
- Schaefer, B. E. (1993): Astronomy and the Limits of Vision, Vistas in Astronomy, 36, 311 (pdf, via Unione Astrofili Italiani)
- Purrington, R. D. (1988): Heliacal Rising and Setting: Quantitative Aspects, Journal for the History of Astronomy, Archaeoastronomy Supplement, 19, 72 (via ADS)