placebound.app / NIGHT SKY AND MARS

Night Sky
Star positions, magnitudes and proper motions: HYG 4.1, David Nash / Astronexus.
https://github.com/astronexus/HYG-Database
Compiled from Hipparcos, Yale Bright Star and Gliese catalogues.
Constellation lines: Stellarium's team, modern sky culture.
https://github.com/Stellarium/stellarium/tree/master/skycultures/modern
Both datasets and the derived Night Sky wallpapers: CC BY-SA 4.0.
https://creativecommons.org/licenses/by-sa/4.0/
City names, centers and aliases: GeoNames, CC BY 4.0.
https://www.geonames.org/

Calculated locally for 22:00 in each city's IANA time zone, including historical
daylight-saving rules. J2000 positions, proper motion, precession and mean
sidereal time; an ideal horizon without atmospheric refraction, buildings,
weather or light pollution. No Sun, Moon, planets or artificial satellites.
This is a wallpaper, not a precision observing chart. East is on the left
because the chart looks upward. Nearby dates and places can look similar.
Prepared collection date: 2026-09-11. Personalization supports 1900-2100.

Mars
NASA / Goddard Space Flight Center / Mars Global Surveyor MOLA Science Team.
Producer: David E. Smith. Dataset MGS-M-MOLA-5-MEGDR-L3-V1.0.
Product: MEGT90N000FB.IMG, 32 pixels per degree, global median topography.
https://pds-geosciences.wustl.edu/mgs/mgs-m-mola-5-megdr-l3-v1/mgsl_300x/meg032/megt90n000fb.lbl
Planetocentric latitude and east-positive longitude; metre elevations relative
to the MOLA areoid. Displayed longitude is normalized to -180 to +180 degrees.
Terrain is smoothed, resampled, colorized, shaded and contoured. Contours every
250 m, emphasized every 1,000 m; relief exaggerated fourfold. Exports omit the
picker's location marker. Selected rectangles are not complete feature bounds.
The picker labels the selected region's landmark; it is not a global gazetteer.

Fonts: Barlow Condensed, Jeremy Tribby; IBM Plex Mono, IBM.
SIL Open Font License 1.1. Full license notices accompany downloadable packs.
Preserve source attribution when sharing images.