Astro Locator makes it simple for astronomers to get their OTA "polar aligned" quickly and easily.

It is of particular benefit to new astronomers who set up and break down each session, so is of great use to those without the luxury of an observatory.

Astro Locator’s primary purpose is to help find Polaris or Sigma Octantis quickly and easily, so ensuring that the astronomer can get polar aligned quickly and easily.

Displaying the current direction, elevation, latitude and longitude, altitude, moon phase, sunrise and sunset times as well as astro twilight times.

All data required to quickly and effectively locate Polaris or Sigma Octantis displayed clearly on one screen.

Astro Locator shows correct elevation.

Accurate time shown in both UTC and local time zones for accurate setup and Iridium flares.

View sunrise and sunset times, as well as astro twilight start and end times to know when viewing and imaging is possible.

See the current moon phase.

Today Extension: Whilst the sunrise & sunset, and astro twilight times are of course available within the app, they are also available for quick access as a Today Widget. Just a quick swipe down to view the days information.

What’s New

Version 1.2.1

Updated for iOS 12.1.
Minor updates.

Ratings and Reviews

4.8 out of 5
6 Ratings
6 Ratings
mukunda1 ,


This is my go to app when setting up. Works great!

Developer Response ,

Thanks for your kind review.

PPNewton ,

quite a compass

Astro Locator is quite the compass and does exactly what it is designed to do. I use it to align my telescope to true North and also set the declination more accurately than the gauges on the scope. One caveat is that, through no real fault of the program, it is really sensitive to any magnetic source. This results in false readings if not adjusted for. I have to move my 12 volt battery pack at least 75 feet away to get an accurate reading. That said, I still like the program and find it useful.

Developer Response ,

Great to hear AstroLocator helps you. Thanks for taking the time to leave feedback.

IrishAstronomer1 ,


Don't waste your money. Bought it hoping to find an obstructed polaris it needs unfortunately to see it.

BTW not intuitive and I work in software.

If you already know how to align your scope this sw is useless, USELESS!

Developer Response ,

Sorry to hear that AstroLocator didn't meet your expectations, and thank you for taking the time to feedback.

The instructions can be found in the FAQs in the app, but are here for you too.
Use Astro Locator to find North and check that there is uninterrupted visibility of Polaris and the target and the targets trajectory during the night.

Level mount using Astro Locator by holding iPhone on top of the mount and adjusting legs. (By placing the iPhone or iPad with Astro Locator on the mount, it is possible to level it by using Astro Locator as a spirit level, i.e. the elevation reading would always want to be 0)

Roughly align mount North using Astro Locator by holding iPhone against the side of the mount. (By placing the iPhone with Astro Locator along the OTA, you can then align the OTA to point north, (when the compass is at 0 / N).)

Using Astro Locator by resting iPhone on top of and in line with the OTA, adjust elevation to match latitude. (Resting the iPhone on the OTA, raising the elevation until the elevation matches the latitude value (at which point the horizontal guide line in the centre will be centred).

Polaris should now be visible in the polarscope where fine adjustments can be made for imaging or if visual only this will be near enough for pretty accurate go-to’s.


Progress Concepts Limited
9.5 MB
Photo & Video
Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2014-2018 Progress Concepts Limited


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