Polar Scope Align

Polar Scope Align is a free, ad-supported polar alignment app for iPhone and iPad.

It calculates the position of Polaris or σ Octantis in your polar scope reticle for your location, date and time, helping you get a quick and accurate polar alignment with an equatorial mount.

POLAR SCOPE ALIGNMENT
• Accurate Polaris and Sigma Octantis position for your date and location
• Atmospheric refraction correction for better accuracy, especially at lower latitudes - readings may differ slightly from simpler apps that skip this correction, but will agree with precise sources (USNO, scientific software)
• Automatic time and location
• Manual location support
• Reticle centering-error measurement and correction
• Zero-position help for common Celestron / Sky-Watcher / Orion style reticles
• Full red night-mode interface

SUPPORTED RETICLES
Polar Scope Align supports 35+ polar scope and finder reticle types, including:
iOptron, Astro-Physics RAPAS & PASILL, Takahashi (EM-10/11/200/400/500, NJP, PM-1, P2-Z), Sky-Watcher / Orion (including EQ6/AZ-EQ and Star Adventurer), Celestron, Meade, EXOS2, Bresser, Vixen (Atlux/SX/SXD/SXP/AXD/GP/GP-DX, Polarie), Astrotrac, Losmandy, Kenko, Avalon, Konus, Telrad, Rigel QuikFinder, and several older polar finders (Tuthill, Explore Scientific, Meade 9x60, Vixen Polaris, Celestron 7x50, Carton Optical).

OBSERVING TOOLS
The free version also includes:
• Moon phase
• Messier, Caldwell and bright-star database
• DSS image downloads for included database objects
• Saved, editable and printable DSO lists
• 8 astronomy calculators for observing and imaging
• Sample Pro tools available from Settings, including aurora forecast

LOOKING FOR ALIGNMENT WITHOUT A POLAR SCOPE?
Polar Scope Align Pro adds the advanced tools many users search for:

• Daytime / No Polar Scope Alignment
• Camera Azimuth Calibration using the Sun, Moon, planets or bright stars
• Laser / Hop Align for night alignment when Polaris is blocked
• Push To / manual GoTo for non-GoTo telescopes
• Live sky maps for Daytime Alignment, Laser / Hop Align, Push To and Hop To
• Full 22,000+ object DSO database
• Xasteria astro weather, aurora, satellite passes and widgets
• 30+ calculators
• Bubble level, compass and iOptron WiFi mount control
• Apple Watch companion app
• No ads

If you only need accurate polar-scope alignment, this free version is a capable tool. If you want alignment without a polar scope, observing planning, weather and field tools, Pro is the complete version.