OpenNGC CC-BY-SA-4.0 & MIT

NGC, IC, Messier & Caldwell Katalogdaten. Mattia Verga — github.com/mattiaverga/OpenNGC

SIMBAD CDS, Strasbourg

Sharpless, Barnard & Abell Katalogdaten; Helligkeitsdaten (Magnitude-Enrichment). Wenger et al. (2000). simbad.u-strasbg.fr

Gaia DR3 ESA

Sterndaten für Sättigungsberechnung (G→V Konversion, Table 5.9). Gaia Collaboration (2023), A&A 674. cosmos.esa.int/gaia

This work has made use of data from the European Space Agency (ESA) mission Gaia, processed by the Gaia Data Processing and Analysis Consortium (DPAC).

NASA SkyView Public Domain

Survey-Bilder (DSS2 Red, DSS2 Blue, DSS). McGlynn et al. (1998). skyview.gsfc.nasa.gov

Digitized Sky Survey (DSS) STScI / AAO

Digitalisierte Himmelsaufnahmen hinter den SkyView-Bildern.

Based on photographic data obtained using the Oschin Schmidt Telescope on Palomar Mountain and the UK Schmidt Telescope. Plates were processed into the present compressed digital form with the permission of these institutions.

7Timer

Seeing-Forecast (NOAA/NCEP GFS-basiert). 7timer.info

Open-Meteo CC-BY 4.0

Wetter-Fallback (ECMWF-basiert). open-meteo.com

OpenStreetMap / Nominatim ODbL

Geocoding (Ortssuche & Reverse-Geocoding). © OpenStreetMap contributors

Falchi et al. (2016)

The new world atlas of artificial night sky brightness. Science Advances, 2(6). — Lichtverschmutzungskarte (Bortle-Bestimmung)

Krisciunas & Schaefer (1991)

A model of the brightness of moonlight. PASP, 103, 1033. — Mond-Aufhellungsmodell