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 1.2.5

- Background updates.

Ratings and Reviews

4.6 out of 5
16 Ratings

16 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.

SanFranFotoShootr ,

Different Directions

Four iOS devices give 4 different readings with a variance of 35 degrees

Developer Response ,

Thanks for downloading Astro Locator. Astro Locator uses your device compass and sensors, so is constrained by the data they provide. If the sensors are giving incorrect data, then so too will Astro Locator. It may be that the devices are experiencing interference (note that they won't be accurate if used indoors), or your devices need re-calibrating (rotate the device in a figure of 8 type movement a few times), or that certain settings that allow the calibration to be more accurate have been turned off (things like Settings > Privacy > Location Services (On) > System Services > Compass Calibration (On) / Motion Calibration & Distance (On), or simply that your devices need a forced restart ( Please can you reach out to me via and mention this, or better still, send an email via the contact option within the app so I can see the debug data too, and I will be sure to help you. Thanks, Neil. ... Update: Thanks for reaching out to me. Glad that we got your iPhone working. Neil.


Progress Concepts Limited
8.1 MB
Photo & Video

Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© 2014-2019 Progress Concepts Limited


  • Family Sharing

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

More By This Developer

You May Also Like