Credits

Data and maps

OpenNGC by Mattia Verga (NGC, IC, Messier and Caldwell objects) · CC BY-SA 4.0
Hickson Compact Groups: Hickson 1982 (CDS VII/213) · CDS
The Bortle class comes from a model of the sky glow (Duriscoe et al. 2018). This product was made utilizing VIIRS Nighttime Lights data produced by the Earth Observation Group, Payne Institute for Public Policy, Colorado School of Mines (CC BY 4.0, via doi:10.5281/zenodo.7750174). The model is calibrated with Globe at Night SQM readings (CC BY 4.0). The usual error is 0.3 magnitude. · CC BY 4.0
GeoNames (place names and time zones) · CC BY 4.0
© OpenStreetMap contributors (map data) · ODbL
Constellation figures: d3-celestial by Olaf Frohn · BSD-3-Clause
Constellation boundaries: Davenhall and Leggett 1989 (CDS VI/49) · CDS
Stars of the object charts: Yale Bright Star Catalogue (CDS V/50) and SAO Star Catalog J2000 (CDS I/131A) · Public domain
Faint stars of the object charts: UCAC4, US Naval Observatory (Zacharias et al. 2013, AJ 145, 44) · Public domain
Grayscale object pictures on Tonight: Digitized Sky Survey (POSS), STScI and Caltech/Palomar, from the PiFinder image pack · STScI
Cloud forecast on Tonight: MET Norway, Locationforecast 2.0 · CC BY 4.0
Protomaps (map tiles and style) · BSD-3-Clause

Telescope pictures

Photo of the ZWO Seestar S50 Pro: ZWO.
Photo of the ZWO Seestar S50: El Mexicano · CC BY-SA 4.0.
Photo of the ZWO Seestar S30 Pro: ZWO.
Photo of the ZWO Seestar S30: ZWO.
Photo of the DWARFLAB Draco: DWARFLAB.
Photo of the DWARFLAB Dwarf 3: DWARFLAB.
Photo of the DWARFLAB Dwarf II: DWARFLAB.
Photo of the DWARFLAB Dwarf mini: DWARFLAB.
Photo of the Vaonis Vespera Pro 2: Vaonis.
Photo of the Vaonis Vespera Pro: Vaonis.
Photo of the Vaonis Vespera 3: Vaonis.
Photo of the Vaonis Vespera II: Vaonis.
Photo of the Vaonis Vespera Passengers: Vaonis.
Photo of the Vaonis Vespera: Vaonis.
Photo of the Vaonis Stellina: Vaonis.
Photo of the Unistellar Odyssey Pro: Unistellar.
Photo of the Unistellar Odyssey: Unistellar.
Photo of the Unistellar eQuinox 2: Unistellar.
Photo of the Unistellar eQuinox: Unistellar.
Photo of the Unistellar eVscope 2: Unistellar.
Photo of the Celestron Origin: Celestron.