GPS Astro is a utility for the iPhone, iPad and iPod Touch that calculates predicted sunrise, sunset, moonrise, moonset times, moon phases as well as civil, nautical and astronomical twilight depending on your current GPS location or for a selected location. Features: Save multiple locations Calendarsync of upcoming moon phases and single moon events Timezone selection iPad Split View Support

GPS Astro alternatives

Dusk and Dawn

Displays sunrise and sunset times. Displays astronomical, nautical, civil and official times. The benefit of this app compared to other sunrise and sunset apps is the flexibility when it comes to the selection of location.

  • size 12.2 MB

Rise&Set

This app calculates the sunrise and sunset time at any selected location around the world, on any date that you specify. Further timings including twilight are also shown along with the phase of the moon.

  • rating 4.2
  • size 6.2 MB

Polar Scope Align Pro

Please note that the only in-app purchases available are tips. All functionality is included. The main reason for this is that while I intend to keep support for iOS 6/7 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.

  • rating 5.0
  • size 29.2 MB

LunaSolCal

Calculate times of sunrise, sunset, moonrise, moonset and more for your location at any given date. The following data is calculated:- Sunrise - Solar noon- Sunset- Day length- Equation of time- Declination- Civil twilight (Dawn/Dusk)- Nautical twilight (Dawn/Dusk)- Astronomical twilight (Dawn/Dusk)- Azimuth at sunrise and sunset- Altitude during solar noon- Sun track- Date and time of Seasons (Spring, Summer, Fall, Winter)- Solstice and Equinox dates- Date and time of next solar eclipse- Moonrise- Moon transit- Moonset- Moon phase- Distance- Declination- Date and time of next new moon- Date and time of next full moon- Azimuth at moonrise and moonset- Altitude during moon transit- Moon track- Date and time of next lunar eclipseSome information for the current day can also be viewed in the notification center. To specify the location of interest either get the position from the built-in GPS or Wifi receiver or select a city from a database with over 30,000 cities in over 200 countries.

  • rating 4.92856
  • size 39.0 MB

iOptron Polar Scope

This is an app to show the position of the Pole Star (Polaris in Northern Hemisphere, or Sigma Octantis in Southern Hemisphere) in the polar scope of all the iOptron(R) telescope/camera mounts. The app uses the best algorithm to calculate the position of Pole Star: The algorithm calculates 3D space motion of the Pole Star itself, precession, temperature and barometric pressure corrected atmospheric refraction, nutation, parallax, aberration, and etc.). NOTE: Since 2017/03/03, This app has the identical result as iOptron 8407, 8408 hand controller and iOptron Commander 5.4.

  • size 1.8 MB