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), allowing a quick and accurate polar alignment. It is one of the few programs that are accurate even 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). It will even allow you to 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, Astrotrac, Losmandy, Kenko, Explore Scientific, Avalon Instruments, Tuthill, 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.

Main features:

-Accurate Polaris / σ Oct position calculation, including atmospheric refraction, stellar aberration, nutation.
-Automatic Time/Location.
-Calculation and correction/compensation for off-center reticles.
-Supports a multitude of polar scopes: iOptron, Astro-Physics RAPAS, 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 / Bresser, the Telrad, a couple for Astrotrac / Losmandy / Kenko / Avalon, the Tuthill Precision Polar Finder, the Explore Scientific 8x50 PolarFinder, the Meade 9x60 Polar Viewfinder and the Vixen SX/SXD/SXP/AXD/GP/GP-DX/Polarie Polar Axis Scopes.
-Remember zero position on Celestron / Skywatcher / Orion etc reticles.
-Full app in red-color night mode.
-Moon phase.
-Messier, Caldwell and Bright star database.
-6 calculators useful for observing and astrophotography.

This free version is ad-supported. You can also try the ad-free Pro version with the following extra features:

-Ability to manually enter time/date and location (including saving favorites, list of recent locations, loading from world location database, searching online).
-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 on which you can always access the polar scope).
-Lunar Calendar with solar/lunar rise/set and twilight times.
-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 control.
-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 20 calculators useful for observing and astrophotography, from eyepiece magnification and field of view, to imaging resolution and reducers.
-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 Named Star list, Meade LX200 star list.
-Screen dimming slider.

The app is updated regularly with new features. From version 3.5, an upgrade of the app to a new version will anonymously share the iOS version, reticle and tools used, so that I can focus development appropriately. The main reason for this is that while I intend to keep support for iOS 7/8 devices for as long as I am allowed, even for very few users, it adds an overhead so I should make sure it is really needed.

What's New

Version 4.3

Why not help Polar Scope Align by leaving a rating or review after trying the new version. There are no popups in the app asking you (annoying!), which unfortunately means there are not many reviews. What's new:

-iPhone X full screen support.
-Bottom bars more consistent.
-Updated instructions (mainly for Astro-Physics RAPAS).

Ratings and Reviews

4.8 out of 5

23 Ratings

23 Ratings

Best Polar Alignment App


When I found out that the recent solar eclipse was not going to be total at my observatory, I had to shoot closer to my home. I used this app to align my old C8 the night before (with no polar scope). It was so accurate that it kept the sun centered for over 5 hours. I then discovered that it had a reticle for my G11 Gemini permanently mounted at my observatory. Now it's aligned better than I was able to get by drift aligning. Works great on my iPad too. Thanks for a great and useful app. Steve Foster

Great app!

Old Boone

Not only does this app help me align my Skywatcher Star Adventurer motorized mount, but it also has a very accurate clock with seconds (which is lacking in the default iOS clock). This is essential to time ISS transits of the moon & glad it also has this feature! Keep up the good work.

Date and time dial do not match


Tried the app. Looks like a great app, but the dials for date and time do not match. For example, today is July 13, time is 2100. As I read the dial (using the vixen polar alignment), the date that matches the correct time is around June 13. Maybe when it was installed, something became miss-configured. If the author can send me a note to fix this, it would be appreciated. This looks like a fantastic app.

Developer Response

Hello. Sorry for the trouble, but are you sure you read the reticle-specific instructions as suggested when you first go to the settings screen? The part of interest is "Note that you should use your local time zone (as long as it is not more than 15 degrees from your location) minus daylight savings". If you don't subtract DST (or your location is farther from the meridian) you would get one month earlier, which seems to be exactly what you describe. The general idea of the app is that it saves you from having to figure out these things, you just duplicate what you see on the screen. If you still have a problem, there is a contact page on the app website, write me and I can help you further as I don't get any notification from reviews.


Dimitrios Kechagias
27.7 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 10x $9.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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