Please note that the only in-app purchases available are tips. All functionality is included.

Polar Scope Align will calculate the position of Polaris or σ Octantis in your Polar Scope reticle for your location (using your phone's GPS or entering a location), allowing a quick and accurate polar alignment. It is one of the few programs that are accurate in lower latitudes by correcting for atmospheric refraction (so expect results to agree only with precise software and not most simplistic "polar align" apps - see the "Accuracy" section in the website for details). It will even allow you to measure and correct a centering error of the reticle - very useful for polar scopes that are not easy to adjust (e.g. iOptron ZEQ25). In the settings you can also select from a collection of reticles, one that matches your own - currently iOptron, Astro-Physics, Takahashi, Orion, Skywatcher, Celestron, Meade, Vixen, Bresser, Explore Scientific, Astrotrac, Losmandy, Kenko, Avalon Instruments, Konus, Tuthill, TeleVue Systems (Carton), Telrad reticles are available. Feel free to contact the developer with any questions, feature requests, extra reticle requests and any problems you have with the app. If you like Polar Scope Align, please consider leaving a review on the app store.

Feature list:

-Accurate calculation of Polaris or Sigma Oct for any date and location, including effect of atmospheric refraction (and annual aberration, nutation).
-Use device time/date and GPS location, or manually enter your own.
-Location manager with favorite locations, list of recent locations, online search and offline world database (cities/towns of at least 1000 population).
-Supports a multitude of polar scopes: iOptron, Astro-Physics RAPAS & PASILL, various versions of Takahashi EM-10/11/200/400/500, NJP, PM-1, P2-Z, the latest Orion / Skywatcher, the Classic Skywatcher / Orion / Celestron / Meade / EXOS2 / Bresser, the Telrad, a couple for Astrotrac / Losmandy / Kenko / Avalon, the Vixen Atlux/SX/SXD/SXP/AXD/GP/GP-DX/Polarie Polar Axis Scopes, a Konus and several Polar Finders: Tuthill, Explore Scientific 8x50, Meade 9x60, Vixen Polaris, Celestron 7x50, Carton Optical. PoleMaster help view for South Hemisphere users.
-Full app in red-color night mode - tools switchable to non night mode view.
-Moon phase & lunar Calendar with solar/lunar rise/set and twilight times.
-Wizard to calculate your reticle centering offset and correct or compensate for it.
-Zoomable reticle view.
-Alt-az alignment error display for mounts that calculate it after star alignment (e.g. iOptron iEQ45, CEM60).
-Polar alignment when your scope is not in zero position (for mounts like iOptron ZEQ/CEM on which you can always access the polar scope).
-Remember zero position on Celestron / Skywatcher / Orion etc reticles.
-Approximate daytime / no polarscope polar alignment tool. Great for solar imaging (including eclipses).
-Bubble level (using either gyro or accelerometer) and Compass heading, as well as magnetic declination reading.
-GPS accuracy & elevation data.
-Red/White/LED light.
-Dimming slider.
-Deep Space Object Database with 13000+ objects from several catalogs (Messier, Caldwell, NGC, IC, Herschell 400, Sharpless 2). The database is searchable and fully configurable with filters, various sorting methods etc.
-Over 25 calculators useful for observing and astrophotography, from eyepiece magnification and field of view, to imaging resolution and reducers.
-Xasteria: World astro-weather report based on 7Timer! data.
-Access to the latest water vapor satellite images.
-List of visible ISS passes and Iridium flares.
-iOptron, NexStar and Meade LX200 Star Lists.
-Support for iPhone & iPad from iOS 7 (and iPod Touch, except compass functions).

From version 3.5, an upgrade will anonymously share the iOS version, reticle and tools used (just once), so that I can focus development appropriately.

What’s New

Version 4.8

Why not help out by rating or reviewing the new version. There are never popups inside the app to ask you (annoying!), which results to less reviews than other apps. Here's what's new:
-Astro-Physics / TeleVue Systems (Carton Optical) PASILL reticle added.
-PoleMaster view added for South Hemisphere users.
-Recent location entries can be deleted from the Location view screen, or the entire list can be emptied at the bottom of the main Xasteria page.

Ratings and Reviews

5.0 out of 5
24 Ratings

24 Ratings

Norfolk Traveller ,

All you need for polar alignments

This is a brilliant app that simply and effortlessly tells me all I need to know to get a great polar alignment. Astrophotography is a hobby that will kick you in the nuts at every opportunity and, frankly, is for saddists. This one blessed little app is about the only thing that never lets me down. Meantime, here comes the clouds, wind, rain, moon, stuck adaptors, focussing issues, USB failures, neighbours that install spotlights, and random bits of dust that appear in your imaging chain and take just enough time to find as it takes to cloud over... great app tho :)

Dan98765 ,

An essential tool for astronomy

Let’s be honest, this is not a mainstream application. It’s a tool for those people who like the stars, own a telescope/mount and what to accurately calibrate it before beginning a visual or photography session. And for that purpose it is the best application you could wish for.

The other features are very useful too such as the dso catalogue and coordinates. But the alignment tool is what makes this app number one on my list of apps to check before starting an imaging session.

Get it. It’s an essential tool.

Stu Raw ,

PS Align Pro

As an absolute newby in the world of Astrophotography as well as engaging with the sharp lurking curve that comes with that along with getting used to a new mount, scope, software, filters, cameras, guiding etc etc, I have found this app an absolute a real help. The polar align techniques and help tools are extremely precise and clear so you can understand them quite easily.

100% recommend to anyone who is starting on the same journey as myself

Well done, fantastic app. No hesitation to give 5 stars 👍🏻


Dimitrios Kechagias
32 MB

Requires iOS 7.0 or later. Compatible with iPhone, iPad and iPod touch.



Age Rating
Rated 4+
© 2015 D Kechagias
In-App Purchases
  1. Tip 1x £0.99
  2. Tip 4x £3.99


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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