Sight reduction4.12 - Google Play
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Publisher Description
Celestial navigation. Take the sextant and get your Line of Position.
Celestial navigation - Astronavigation
Sight reduction:
- Marcq Saint Hilaire Line of Position, intercept method (p=Ho-Hc, Zn)
- Input for observed altitude Ho or instrumental Hs (Nautical Almanac data needed for the Sun and the Moon)
- Calculator for Intercept method (p=Ho-Hc, Zn) altitude Hc and azimuth Zn
- Running fix
- Plots up to 3 Marcq Saint Hilaire Lines of Position on Google maps
- Local hour angle (LHA)
- List of navigational stars
- Logbook (output is copied to clipboard)
- New optimized user interface
- GNSS fix to check the solution
Sight reduction is the process of deriving from a sight the information needed for establishing a line of position.
This app is a calculator to get the intercept from the assumed position of the observer AP(latitude, longitude), the geographical position of the celestial body observed, GP(Dec, GHA), and its corrected altitude Ho.
Manual and examples in the developer's website.
Ref: https://en.wikipedia.org/wiki/Sight_reduction
User interface:
- Zoom buttons +/-
- Map types: standard, terrain, and satellite
- GPS location. ("Location" App permission must be allowed. Switch on you GPS, and then automatic location detection is possible)
About Sight reduction
The company that develops Sight reduction is Navigational Algorithms. The latest version released by its developer is 4.12.
To install Sight reduction on your Android device, just click the green Continue To App button above to start the installation process. The app is listed on our website since 2025-04-25 and was downloaded 0 times. We have already checked if the download link is safe, however for your own protection we recommend that you scan the downloaded app with your antivirus. Your antivirus may detect the Sight reduction as malware as malware if the download link to com.Sightreduction is broken.
How to install Sight reduction on your Android device:
- Click on the Continue To App button on our website. This will redirect you to Google Play.
- Once the Sight reduction is shown in the Google Play listing of your Android device, you can start its download and installation. Tap on the Install button located below the search bar and to the right of the app icon.
- A pop-up window with the permissions required by Sight reduction will be shown. Click on Accept to continue the process.
- Sight reduction will be downloaded onto your device, displaying a progress. Once the download completes, the installation will start and you'll get a notification after the installation is finished.
Program Details
System requirements
Download information
Pricing
Version History
version 4.12
posted on 2025-04-25
Upgraded to:
Android 16 - SDK 36
new Google Maps 'com.google.android.gms:play-services-maps:19.2.0'
version 4.12
posted on 2025-04-25
Upgraded to:
Android 16 - SDK 36
new Google Maps 'com.google.android.gms:play-services-maps:19.2.0'
version 4.11
posted on 2024-07-16
Upgraded to 'com.google.android.gms:play-services-maps:19.0.0'
version 4.10
posted on 2023-12-05
Updated to:
-play-services-maps:18.2.0
-android API 34
version 4.9
posted on 2023-11-07
- Updated to Android API 34
version 4.8
posted on 2023-08-24
version 4.6
posted on 2021-06-03
- Updated to Android 11.0
version 4.3
posted on 2020-05-01
- Plot up to 3 Marcq Saint Hilaire Lines of Position on Google maps
- Calculator for Intercept method (p=Ho-Hc, Zn)
- Input for observed altitude Ho or instrumental Hs
- List of navigational stars
- Logbook
- New optimized user interface
- GNSS fix to check the solution
version 4.2
posted on 2020-04-06
- Plot up to 3 Marcq Saint Hilaire Lines of Position on Google maps
- Calculator for Intercept method (p=Ho-Hc, Zn)
- Input for observed altitude Ho or instrumental Hs
- List of navigational stars
- Logbook
- New optimized user interface
version 4.0
posted on 2020-03-01
- Plot up to 3 Marcq Saint Hilaire Lines of Position on Google maps
- Calculator for Intercept method (p=Ho-Hc, Zn)
- Input for observed altitude Ho or instrumental Hs
- Logbook
- New optimized user interface
Disclaimer
Official Google Play Link
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