5 nights. A session is one continuous stretch of shooting in one place — frames separated by more than three hours, or by more than three kilometres, belong to different nights.
Sources Weather data by Open-Meteo.com · NOAA HRRR · CC-BY-4.0 · non-commercial use only Weather data by Open-Meteo.com · ECMWF ERA5 · CC-BY-4.0 · non-commercial use only Air quality data by Open-Meteo.com · Copernicus CAMS · CC-BY-4.0 · non-commercial use only U.S. Geological Survey 3D Elevation Program · public-domain Earth Observation Group, Payne Institute for Public Policy, Colorado School of Mines · CC-BY-4.0 International Meteor Organization, Working List of Visual Meteor Showers · see IMO terms NOAA NCEI / British Geological Survey, World Magnetic Model 2025 · public-domain astronomy-engine (Don Cross), VSOP87 / NOVAS C 3.1 · MIT Open-Meteo free tier is NON-COMMERCIAL ONLY; subscriptions and advertising are named as commercial use in the published terms. This binds both weather and aerosol at once, so Syzygy cannot carry advertising or a subscription while it uses them.
CC-BY-4.0 sources require attribution of both Open-Meteo and the underlying model.
Photographs and reconstructed conditions are the work of one photographer. Exact locations are deliberately not published; places appear as named areas. Every atmospheric value is model output, never a measurement taken at the site.