zstarview 🌌

See the starry sky, even when it's cloudy or the sun is out.

Zenith Star View is a desktop sky viewer for your chosen location. The name emphasizes the zenith, the point directly overhead.

clickpy Top 25 as of 2026-05-23 View on clickpy

It renders an all-sky view with stars, the Sun, Moon, planets, deep-sky objects, and guide overlays. When enabled, it can also add real-time cloud imagery, terrain horizon, urban outlines, night lights, and nearby aircraft. Locations can be set by city or viewpoint name, direct coordinates, online place search, or supported Google Maps URLs.

Features:

• Stars: the sky view shows stars from the selected catalog, with asterisms and other overlays layered on top.
• Solar-system bodies: supports Sun, Moon, and major planets. Minor planets (asteroids) are not displayed yet.
• Search: search named stars, asterisms, places, known artificial satellites, and JPL bodies from one dialog. When local matches are not found, known artificial satellites use the app's current position first; if a target is recognized as a known artificial satellite but its current position cannot be obtained, the search fails instead of falling back to JPL. Persistent marker mode keeps both the marker and label visible on the selected target.
• Overlay groups: the features below are grouped by display layer, and each overlay can be toggled individually from the menu or with its keyboard shortcut.
• Flexible location and view center: specify the observer location with a city name, tower name, mountain name, direct latitude/longitude input, supported Google Maps coordinate URLs, or online place/station search via Nominatim. Adjust the view center with -A / -Z or the arrow keys. The HUD also shows the observer location and the current alt/az view center.
• Terminal image export: zstarview-export-image can render the sky headlessly and write it to a file or display it directly in sixel-capable terminals.
• Python support: the project is routinely tested on CPython 3.10, 3.11, 3.12, 3.13, and 3.14.

Celestial overlays:

• Deep-sky objects: named galaxies/open clusters/globular clusters are shown as soft blue extents.
• Asterism overlay: popular line patterns rather than formal IAU constellation boundaries are shown as dim ambient lines. Mouse-hovering a star in an asterism brightens the matching pattern and shows its label, with 3-second rotation when multiple asterisms share that star.
• Sky Guides: guide overlays include the never-rises region as a guide-line style solid circle, and the celestial equator as a dashed line with longer on-segments in the same neutral gray, along with direction labels around the horizon, a zenith marker, and celestial pole markers.

Atmospheric and man-made overlays:

• Sky Color: the sky-color disc can be shown as a gradient sky disc or as a flat dark-disc fallback.
• Clouds: real-time Himawari/GOES satellite data are downloaded and rendered as a stylized hatched (striped) overlay, and the sky-color disc remains visible beneath the clouds. An experimental Geo-satellite path is also available for Europe-band observers when --geo-satellite true is specified. Missing regions are shown in faint yellow when satellite coverage is partial. See an example with partial coverage and yellow missing-data tint.
• Artificial satellites: ISS, JWST, Voyager 1, Voyager 2, and Parker can be drawn as small purple markers between the planet and aircraft layers.
• Aircraft: nearby aircraft from OpenSky can be drawn as purple predicted-motion polylines.

Building and ground guide overlays:

• Earth guide: an independent layer draws a simplified continental hatch pattern below the horizon in the same ground tone to help with orientation.
• Terrain horizon: Copernicus DEM data can be downloaded to render the local terrain skyline. The terrain overlay shows banded ridge lines in the same horizon color, with nearby bands drawn thicker and distant bands drawn thinner. Blue-tinted ridge lines mark the parts visible from the observer, not hidden by nearer ridges. The disc is filled with the same ground tone below the terrain horizon, or below the geometric horizon when terrain is disabled.
• Urban outline: major rooflines are drawn as a white urban outline overlay for the current viewpoint. In some skyscraper-heavy cities, distant skyscrapers can also be added from within a 60km radius.
• Water surface: nearby water bodies are rendered as small blue dots. Sea points come from OSM Water Polygons sea-mask tiles, while inland water points come from OpenStreetMap features fetched via Overpass API. See About Water Surface.
• Night lights: NASA Earth at Night / Black Marble 2016 Grayscale 500m GeoTIFF tiles are downloaded on demand, cached locally, and rendered as a separate glow layer above the horizon and terrain ridges.

Screenshots

The first screenshot shows the asterism overlay and also serves as a terrain-horizon example. The second screenshot shows the aircraft overlay together with the never-rises region. The third screenshot shows a denser star field rendered with -V10.5 -s4.5. The fourth screenshot shows zstarview-export-image --search "C/1861 G1" --sixel displaying the Thatcher comet (C/1861 G1 Thatcher) in a sixel terminal.

Note: higher magnitude limits increase rendering time. See About magnitude limit.

Urban outline and terrain horizon examples from several cities worldwide:

Circular Quay, Sydney	Near Tokyo Tower, Tokyo	View of Mt. Fuji, Japan	Marina Bay, Singapore

Near Burj Khalifa, Dubai	Jungfraujoch, Switzerland	Manarola, Italy	Sagrada Familia, Barcelona

Installation (Recommended: pipx)

Prerequisite for the urban outline overlay: install the overturemaps CLI separately. Installation: https://pypi.org/project/overturemaps/

Confirm it with:

overturemaps --help

Zstarview is intended to be installed using pipx.

Note: Linux x86_64 is the primary tested platform. The cloud-disc path no longer depends on pyresample, so its previous Windows on Arm64 installation blocker has been removed.

pipx install zstarview

Upgrade:

pipx upgrade zstarview

First run check:

zstarview-gui

This opens the startup dialog first. Use zstarview-gui for the default GUI launch flow after installation. If you select City as the location source and press Auto Search, the startup dialog fills in your current location automatically.

Note: Troubleshooting tips (including X11 libraries and slow network) are summarized below.

Usage

Use zstarview-gui for the interactive startup dialog, zstarview for GUI launches driven by CLI options, and zstarview-export-image for headless one-shot image export.

After launching zstarview-gui, the Auto button in the Location tab uses network connection information to estimate the current observer location and fills it into the dialog.

The CLI reference below documents zstarview and zstarview-export-image.

zstarview [options] [location]

Note (Ubuntu/Wayland, GNOME): If the taskbar icon does not appear when launching from a terminal, follow the steps in Tools under Generating a .desktop launcher (GNOME only).

Quick examples:

zstarview Tokyo
zstarview auto
zstarview "Tokyo Skytree"
zstarview "35.68;139.76" --datetime "2025-09-12 21 JST"
zstarview --place "Matsue Station" --place-countrycode jp
zstarview --search Ceres

CLI Reference

Argument

Format	Description	Default
City Name	City name (e.g., Tokyo)	Last run location (or Tokyo)
Tower/Mountain	Tower (e.g., t/Tokyo Skytree) or Mountain (e.g., m/Mount Fuji)
Coordinates	Direct coordinates (e.g., 35.68;139.76, @35.68,139.76) or Google Maps URL
auto	Automatically detect current location via IP

The links below cover the detailed option groups, and the linked docs files contain the detailed option tables, footnotes, and examples.

• Observing Location and Time
• Viewpoint Dataset Queries for Observing Locations
• Search Objects at startup
• Sky and Stars
• Overlays
• General

Tools

Tools

zstarview-export-image

Use zstarview-export-image for one-shot image export without starting the GUI.

zstarview-export-image Matsue -o matsue.png

zstarview-export-image writes the usual location/time/view/vmag summary to stderr after rendering, or immediately before terminal image output when --sixel is used.

For troubleshooting or manual cache maintenance, you can print the cache root directory without rendering:

zstarview-export-image --print-cache-dir

If you really need to bypass the --clear-long-lived-cache cooldown, first run zstarview-export-image --print-cache-dir, then remove these subdirectories under that cache root before startup:

• copernicus-dem
• overture_buildings
• overture_skyscrapers

Generating a .desktop launcher (GNOME only)

On GNOME-based environments (including Ubuntu Dock and DockToPanel), a .desktop file is required for the correct icon to appear in the taskbar.

This application includes a helper command to generate it:

# Create zstarview-gui.desktop in the current directory
zstarview-make-desktop-file

# Install to ~/.local/share/applications
zstarview-make-desktop-file --write

• Without --write, the file zstarview-gui.desktop is created in the current directory.
• With --write, it is installed to ~/.local/share/applications and registered with the desktop database.

Note: This launcher integration is only intended for GNOME-based environments. It is not required on other desktop environments, and may not work as intended elsewhere.

The GUI supports direct keyboard and menu-based navigation, search, and overlay toggles.

GUI operations

GUI

Key Operations

• ← / →: Rotate view azimuth by ±5°
• ↑ / ↓: Change view altitude by ±5° (clamped to -45°..90°)
• Shift + arrow keys: Fine-tune view direction by 1° While arrow-key input continues, the app keeps a simplified viewport-interaction mode for about 0.7 seconds after the last input. In this mode, it shows stars up to Vmag <= 4.0, the Sun, Moon, planets, the celestial equator, ecliptic, horizon, terrain horizon, direction labels, the zenith marker, and the celestial pole markers; full star density, sky-color disc, clouds, night lights, DSO, asterisms, and urban outlines are temporarily hidden.
• M: Toggle moon enlarged to 5x size
• D: Toggle DSO overlays
• A: Toggle asterism overlays
• G: Toggle sky guides
• S: Toggle sky color visibility
• C: Toggle cloud overlays
• L: Toggle night lights overlay
• P: Toggle aircraft overlay
• I: Toggle artificial satellite overlay
• T: Toggle terrain horizon overlay
• E: Toggle earth guide overlay
• U: Toggle urban outline overlay
• Ctrl+J: Open Jump to Named Star
• Ctrl+F: Open Search Objects
• F11: Toggle fullscreen display
• ESC: Exit fullscreen
• Q: Quit

Menu Operations

From the hamburger menu (☰), you can use:

• Jump to Named Star...: Choose from representative named stars (Vmag <= 2.0), grouped into North / Equatorial / South, then jump the view center to that star.
• Search Objects...: Search across named stars, supported asterisms, places, known artificial satellites, and JPL bodies, then jump to the selected target. If the local star/asterism search finds nothing, known artificial satellites use the app-side current position first; if a target is recognized as a known artificial satellite but its current position cannot be obtained, the search fails instead of falling back to JPL. Use Keep marker to keep both the marker and label visible after the jump.
• Search Places...: Open a separate place-search dialog backed by OpenStreetMap Nominatim, list matching places/stations/facilities, and jump toward the selected ground location.
• Set View Center...: Open a direct Alt/Az dialog with the current values prefilled, then apply the entered view center immediately.
• Enlarge Moon: Toggle moon enlarged to 5x size.
• DSO: Toggle deep-sky object overlays on/off.
• Asterisms: Toggle asterism overlays on/off (when enabled, dim overlays stay visible; hovering a member star brightens the matching asterism and shows its label).
• Guidelines: Toggle the geometric horizon, celestial equator, ecliptic, never-rises solid circle, direction labels, zenith marker, and celestial pole markers on/off. The celestial equator uses a longer dashed stroke in the same neutral gray as the never-rises circle.
• Observation Info: Toggle the observation-info block on/off. When shown, it stays at the bottom-left by default; auto keeps the older hover-avoid placement behavior.
• Sky Color: Switch between the full sky-color gradient and the flat dark-disc fallback.
• Clouds: Toggle real-time cloud overlays on/off.
• Night Lights: Toggle the NASA Earth at Night / Black Marble overlay on/off. If disabled from the CLI with --night-light-opacity 0, the menu item cannot re-enable it for that run.
• Aircraft: Toggle the OpenSky-based aircraft overlay on/off. If disabled from the CLI with -a 0 / --aircraft-opacity 0, the menu item cannot re-enable it for that run.
• Satellites: Toggle the ISS artificial satellite overlay on/off. If disabled from the CLI with --satellite-opacity 0, the menu item cannot re-enable it for that run.
• Terrain Horizon: Toggle the terrain skyline overlay on/off. If disabled from the CLI with -d 0 / --terrain-horizon-opacity 0, the menu item cannot re-enable it for that run.
• Earth Guide: Toggle the below-horizon earth-guide overlay on/off. If disabled from the CLI with -e 0 / --earth-guide-opacity 0, the menu item cannot re-enable it for that run.
• Urban Outline: Toggle the Overture-derived urban roofline overlay on/off. If disabled from the CLI with -u 0 / --urban-outline-opacity 0, the menu item cannot re-enable it for that run.
• Fullscreen: Toggle fullscreen display.
• Exit: Quit the application.

After a jump/search, the selected star is highlighted for about 3 seconds using the same UI style as mouse hover (circle marker + name label).

The same simplified viewport-interaction mode is also used during window resize to keep interaction responsive while heavier layers catch up after idle.

Urban Outline Data

zstarview now fetches urban-outline source data on demand from Overture Maps and caches the derived building tiles under the app cache directory. The first launch for a new viewpoint/radius/height combination may take a few seconds while the download finishes; the outline appears automatically after the cache is ready.

This path requires the overturemaps CLI to be installed separately. Confirm it with:

overturemaps --help

Useful startup options:

zstarview "Tokyo Tower" -r 2.5 -b 0
zstarview -p "Matsue Station" -r 2.0 -b 20

• -r, --urban-outline-radius-km: fetch radius in kilometers
• -b, --urban-outline-min-building-height-m: minimum building height in meters
• --urban-outline-feature-type: choose which urban-outline data is used for display; default both

Troubleshooting and platform notes

Troubleshooting

X11 (Ubuntu/Debian)

Qt's xcb platform plugin may require libxcb-cursor0 at runtime. If you're not watching for X11 vs Wayland differences, this can be confusing — running from a terminal may show errors like:

$ zstarview
qt.qpa.plugin: From 6.5.0, xcb-cursor0 or libxcb-cursor0 is needed to load the Qt xcb platform plugin.
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: eglfs, offscreen, wayland-egl, linuxfb, wayland, minimal, xcb, vkkhrdisplay, minimalegl, vnc.

Install the missing libxcb-cursor0 package with:

sudo apt install libxcb-cursor0

Wayland Window Shadows

On some Wayland desktops, a normal framed zstarview --window-frame window window may appear without the usual outer shadow. This is usually caused by the Wayland decoration/compositor path rather than by zstarview's own window settings.

If you prefer the X11-style shadowed window appearance, a practical workaround is to launch the app through XWayland:

QT_QPA_PLATFORM=xcb zstarview --window-frame window

If the shadow appears with QT_QPA_PLATFORM=xcb, that confirms the difference is in the Wayland vs X11 window-decoration path on your desktop environment.

Wayland Flicker With QT_QPA_PLATFORM=xcb

On some Wayland systems, forcing QT_QPA_PLATFORM=xcb can make the frameless window flicker, especially when maximized. The visible symptom is that the desktop or windows behind zstarview briefly show through during repaint.

If this happens, do not force QT_QPA_PLATFORM=xcb for the normal frameless UI. Launch zstarview without that variable, or use the standard framed window mode if you specifically need XWayland:

zstarview
zstarview --window-frame window

Slow or Unstable Network / Offline Use

1. Planetary ephemeris data

   On the very first launch, the app downloads a planetary ephemeris file (de442s.bsp). This requires network connectivity once. After it is cached, the app can run offline.

2. Cloud satellite imagery

   Cloud rendering downloads satellite imagery from public S3 buckets (Himawari / NOAA GOES) and relies on heavy dependencies. If your network is slow or unavailable, disable clouds with -c 0. You can still explore stars/planets and sky colors without cloud overlays.

3. Terrain horizon

   Terrain horizon rendering downloads Copernicus DEM tiles once and then reuses the local cache. If your network is slow or unavailable, disable terrain horizon rendering with -d 0 or --terrain-horizon-opacity 0. You can still explore stars/planets and sky colors without terrain overlays.

4. Night lights data

   Night lights use NASA Earth at Night / Black Marble 2016 Grayscale 500m GeoTIFF tiles. The app downloads the tiles on demand, caches them locally, and reuses the cache on later launches. If your network is slow or unavailable, disable the layer with --night-light-opacity 0. If the cache is already present, the app can keep showing the night lights overlay without network access.

5. Artificial satellite data

   The artificial satellite overlay fetches ISS orbital data at runtime, using wheretheiss.at as the primary source and CelesTrak as a fallback, and fetches JWST, Voyager 1, Voyager 2, and Parker from JPL Horizons. Fresh current caches are reused for up to 24 hours for both the ISS cache and the Horizons-backed spacecraft cache. The layer is available only for realtime views; time-shifted views do not fetch or display artificial satellites. If your network is slow or unavailable, disable the layer with --satellite-opacity 0. If a fresh cache is already present, the app can keep showing the satellite overlay without network access.

6. Aircraft data

   The aircraft overlay fetches OpenSky Network state data at runtime. By default it refreshes once every 5 minutes. This interval is intentionally conservative so the app keeps practical headroom for free-tier use, temporary failures, and retries rather than polling more aggressively. If you want to avoid OpenSky queries entirely, disable the layer with -a 0.

Cloud-related status text uses idle / downloading / partial:

• downloading: fetching source imagery from S3
• partial: rendered with available data only; missing regions are tinted faint yellow

After the GOES-East refresh to GOES-19, some places that previously showed only a generic "satellite not covering this region" result can now render as partial coverage instead. This now includes some locations in Europe. In those cases, covered parts of the sky show cloud imagery and uncovered parts show the faint yellow missing-data tint. See screenshot5 for an example around 77-87% coverage.

Sky Update Interval and CPU Load

Frequent sky updates can be CPU‑intensive on lower‑end machines. Increase the interval to reduce load (e.g., -i 300 for every 5 minutes). Lower it only if your machine can keep up.

Viewing Logs

Launching from a terminal as $ zstarview shows startup messages and errors. Logs are also written to a file (platform‑dependent). Examples:

• Linux: ~/.cache/zstarview/logs/app.log
• macOS: ~/Library/Logs/zstarview/app.log
• Windows: %LOCALAPPDATA%/tos-kamiya/zstarview/Logs/app.log

If normal startup closes too quickly to inspect, try zstarview-debug from a terminal. It is mainly for Windows troubleshooting. On Linux, zstarview-debug behaves the same as zstarview.

On Windows, Windows Security may block loading Python extension modules and the app may stop during startup. If that happens, changing the Smart App Control setting under Windows Security App & browser control may help. However, this weakens security, so it is not recommended outside a trusted environment. See this Smart App Control screenshot.

Code, Data Licenses, and Credits

Code, Data Licenses, and Credits

This software is provided under the MIT License.

However, the included data is redistributed according to their respective licenses.

All paths below are relative to src/zstarview/data/.

File	Content	Source	License
cities1000.txt, admin1CodesASCII.txt	List of cities with a population of 1000 or more	GeoNames	CC BY 4.0
viewpoints/tower_viewpoints.json	Tower/viewpoint dataset packaged for tower-name startup resolution (derived and normalized from Wikidata)	Wikidata via local normalization/query workflow documented in docs/developer/viewpoint-dataset-generation.md	CC0 1.0 (Wikidata data)
viewpoints/mountain_viewpoints.json	Mountain/viewpoint dataset packaged for mountain-name startup resolution (Wikipedia-curated candidates normalized with Wikidata metadata)	Wikipedia candidate collection plus Wikidata normalization workflow documented in docs/developer/viewpoint-dataset-generation.md	CC0 1.0 (Wikidata data)
earth_guide_land_110m.json	Simplified land geometry used to generate the below-horizon Earth guide hatch pattern, derived from Natural Earth 1:110m land polygons	Natural Earth	Public domain
Runtime --place geocoding requests sent to OpenStreetMap Nominatim	Online place-name geocoding used only when --place is requested	OpenStreetMap Nominatim	Nominatim Usage Policy
Runtime IP geolocation requests sent to ip-api.com	IP-based location lookup used when auto is requested	ip-api.com	ip-api.com Terms of Service / Privacy Policy
Runtime water-surface overlay data fetched via Overpass API	Water-surface points derived from OpenStreetMap inland water features for the optional river/lake/pond layer; sea-mask tiles are derived from https://osmdata.openstreetmap.de/data/water-polygons.html	OpenStreetMap, Overpass API, OSM Water Polygons	ODbL 1.0
On-demand urban-outline cache under the app cache directory	Derived building tiles and tile_index.json files produced from downloaded Overture building data	Overture Maps Buildings downloaded at runtime via the overturemaps CLI	ODbL 1.0
On-demand night lights cache under the app cache directory	NASA Earth at Night / Black Marble 2016 Grayscale 500m GeoTIFF tiles used for the optional night lights overlay	NASA Earth at Night / Black Marble maps	See NASA Earth at Night / Black Marble maps for the published NASA data use terms.
Runtime aircraft overlay data fetched from OpenSky Network	Aircraft state vectors used for the optional nearby-aircraft overlay	OpenSky Network REST API	OpenSky Network Terms of Use
Runtime JPL Horizons / Small-Body Database requests	Search / ephemeris data used for celestial-body lookup and the JWST / Voyager / Parker spacecraft cache	JPL Horizons, JPL Small-Body Database	See the JPL/JPL SSD sites for current usage terms and data notes
Runtime artificial satellite overlay data fetched from wheretheiss.at with CelesTrak fallback	Orbital-element data used for the optional ISS overlay	wheretheiss.at, CelesTrak	See each source site for current terms and licensing details
Runtime Geo-satellite cloud overlay data fetched from MET Norway	Geo-satellite cloud imagery used for the optional Europe workflow cloud overlay	MET Norway Geo-satellite documentation, MET Norway Licensing and crediting	CC BY 4.0
dso.csv	Deep-sky object catalog (named galaxies/open clusters/globular clusters; generated from OpenNGC)	OpenNGC via PyOngc	CC BY-SA 4.0 (OpenNGC database)
On-demand terrain DEM cache under the app cache directory	Terrain horizon source data (Copernicus DEM GLO-90)	Copernicus DEM / Copernicus Data Space Ecosystem via public AWS S3 distribution used by the app	Copernicus DEM GLO-90 access terms as described by Copernicus Data Space Ecosystem, including "Licence for COP-DEM-GLO-90-F Global 90m Full, Free & Open" / "Licence for the use of the Copernicus WorldDEM™-90"
stars/IAU-Catalog of Star Names (always up to date).csv	IAU WGSN catalog of approved star names	exopla.net	CC BY 4.0
Noto_Sans/*	Font for displaying text	Google Fonts	SIL Open Font License 1.1

Credits

• Astronomical data provided by CDS Strasbourg and the ESA Hipparcos Mission.
• City data based on GeoNames.
• Tower/viewpoint startup data are derived from Wikidata and redistributed under Wikidata's CC0 data terms.
• Mountain/viewpoint startup data are curated from Wikipedia candidates and normalized with Wikidata metadata; redistributed here under Wikidata's CC0 data terms.
• Earth guide land geometry is derived from Natural Earth 1:110m land polygons. Natural Earth treats the data as public domain; credit is optional, but we note the source here.
• Urban outline source data are downloaded on demand from Overture Maps Buildings and converted into cached derived building tiles for runtime use.
• Night lights source data are downloaded on demand from NASA Earth at Night / Black Marble and cached locally as GeoTIFF tiles for runtime use.
• Star proper names provided by the IAU Working Group on Star Names (WGSN) (via exopla.net).
• Cloud data are based on infrared observations from the Himawari satellite (provided by JMA) and the NOAA GOES series (provided by NOAA/NESDIS), retrieved from their public S3 buckets.
• Geo-satellite cloud imagery is provided by MET Norway (The Norwegian Meteorological Institute) and used under CC BY 4.0 terms, with attribution to MET Norway as the data source.
• Aircraft overlay data are fetched from OpenSky Network at runtime and are subject to the OpenSky Network Terms of Use.
• Celestial-body search uses JPL Horizons and the JPL Small-Body Database at runtime to resolve matches and observer ephemerides. Search results and ephemerides are subject to the current JPL/JPL SSD usage terms and data notes.
• Orbital data (TLE/OMM) for the artificial satellite overlay are fetched from wheretheiss.at with CelesTrak as a fallback source.
• Terrain horizon data are based on Copernicus DEM GLO-90, managed by ESA on behalf of the European Commission and obtained by the app through its public AWS distribution/cache flow.
• Place/station search via --place uses the public OpenStreetMap Nominatim service and is subject to the Nominatim Usage Policy.
• Automatic IP-based location lookup uses ip-api.com and is subject to the ip-api.com Terms of Service / Privacy Policy, including its non-commercial-use restriction and 45 requests per minute limit.
• Water-surface overlay data for rivers, lakes, and ponds are derived from OpenStreetMap inland water features fetched through Overpass API and are attributed to OpenStreetMap contributors under ODbL 1.0.
• Sea-mask tiles for ocean water surfaces come from OSM Water Polygons and are also covered by the OpenStreetMap attribution / ODbL 1.0 terms used by that dataset.
• Thanks to Overture Maps and its source data contributors for making large-scale building data available.
• Thanks to AWS and dataset providers for making the public S3 distribution/mirror endpoints available for cloud imagery and terrain DEM access.
• Fonts provided by the Google Noto Project.
• The window title "Zenith Star View" was suggested by ChatGPT.
• Specification discussions, code generation, and debugging were greatly assisted by Gemini and ChatGPT.

Appendix

→ Developer Docs

→ Specification, Design

→ Release Notes

→ Lunar eclipses in 2026-2028, Solar eclipses 2026-2028