https://github.com/sighmon/mearth-apple
Where on Earth is the temperature similar to Mars, the Moon, and home? For iOS, macOS, and tvOS.
https://github.com/sighmon/mearth-apple
apple earth ios macos mars moon radiation temperature tvos uv
Last synced: 23 days ago
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Where on Earth is the temperature similar to Mars, the Moon, and home? For iOS, macOS, and tvOS.
- Host: GitHub
- URL: https://github.com/sighmon/mearth-apple
- Owner: sighmon
- Created: 2026-04-15T11:11:23.000Z (3 months ago)
- Default Branch: main
- Last Pushed: 2026-05-28T11:59:36.000Z (about 1 month ago)
- Last Synced: 2026-05-28T13:26:15.088Z (about 1 month ago)
- Topics: apple, earth, ios, macos, mars, moon, radiation, temperature, tvos, uv
- Language: Swift
- Homepage: https://apps.apple.com/us/app/mearth/id6761681461
- Size: 107 MB
- Stars: 0
- Watchers: 0
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# Mearth
Where on Earth is the temperature similar to Mars, the Moon, and home?
Mearth is a SwiftUI app for iPhone, iPad, Mac, Apple TV, widgets, and iOS Live Activities.
Based on our [2013 NASA SpaceApps Challenge](https://github.com/sighmon/mearth)
Apple App Store: https://apps.apple.com/us/app/mearth/id6761681461
Test Flight: https://testflight.apple.com/join/T2J3xSeS
## Functionality
- Dashboard with four cards:
- `Mars`: latest Curiosity weather at Gale Crater
- `Earth Match`: closest sampled Earth city temperature to Mars
- `Moon Estimate`: modeled Apollo 11 / Tranquility Base conditions
- `Local`: current temperature near the user
- Temperature, UV, and radiation comparison:
- Earth and local UV are live when available
- Mars and Moon UV are modeled as Earth-style UV Index equivalents
- Radiation is shown separately in `µSv/h`
- Temperature units:
- app-wide automatic region detection
- manual `°C` / `°F` override from the Local modal
- Tap-through modals:
- Earth uses native Apple Maps
- Mars and Moon use interactive SceneKit globes with curated mission / landing sites
- modals include coordinates, context, and source links
- Widgets and Live Activities:
- Home Screen / macOS widgets
- Lock Screen accessory widgets
- Dynamic Island / Live Activity on iPhone
- Resilience:
- last successful results are cached
- cached data is shown when a source fails
- the UI indicates when data is cached / stale
- Development support:
- dashboard preview/mock mode
- Xcode previews for the app views and widget families
## Data Sources
- Mars weather:
- CAB / INTA-CSIC Curiosity REMS widget feed
- `http://cab.inta-csic.es/rems/wp-content/plugins/marsweather-widget/api.php`
- Earth match:
- Open-Meteo sampled city comparison set
- Local weather:
- Apple Location Services for coordinates
- Apple Weather / WeatherKit when available
- Open-Meteo fallback
- IP geolocation fallback via `ipapi.co`, then `ipwho.is`
- Moon:
- modeled estimate for Apollo 11 / Tranquility Base based on local solar angle
- Radiation / UV context:
- NASA / JPL, NASA UV references, and Apollo-era lunar radiation references are linked in-app in the location modal
## Privacy
- The app requests location permission only to show the local weather card and to auto-detect the preferred temperature unit by region.
- When location access is granted, the app uses the device's approximate/current location to look up local weather.
- If Apple location or WeatherKit data is unavailable, the app can fall back to IP-based geolocation via `ipapi.co` and `ipwho.is` so the local card is still usable.
- The app does not use location for advertising, profiling, or background tracking.
## Build
- `xcodebuild -project Mearth.xcodeproj -scheme Mearth -destination 'generic/platform=iOS Simulator' CODE_SIGNING_ALLOWED=NO build`
- `xcodebuild -project Mearth.xcodeproj -scheme Mearth -destination 'generic/platform=tvOS Simulator' CODE_SIGNING_ALLOWED=NO build`
- `xcodebuild -project Mearth.xcodeproj -scheme Mearth -destination 'generic/platform=macOS' CODE_SIGNING_ALLOWED=NO build`