iNA computes all ephemeris data available in the daily pages of the USNO Nautical Almanac. This information is required when doing astronomical computations for celestial navigation, local noon, sunrise, and others. The program computes GHA, Dec, SHA, SD, HP, magnitudes, sunrise, sunset, LAN, twilight times, moonrise, moonset, moon age and phase for sun, moon, 5 planets, and 173 stars; all at GMT which is longitude 0. INA also computes addition useful information not included in the Nautical Almanac such as ephemeris for Mercury, Hc at LAN, bearing of sunrise and sunset (amplitudes), and the GHA of Aries midway between civil and nautical twilights for star planning.
INA's internal celestial almanac is valid for the years 1582 through 2800 AD.
iNA requires no external resources to complete its computations. Internet access is not required to use this program or to access any of its help files.
iNA returns results at GMT which is longitude 0. Interpolation for your specific location and/or times other than on the hour, must be computed manually. We recommend using StarPilot which has a built-in Nautical Almanac and will perform all the complex calculations for you.
This app has been updated by Apple to use the latest Apple signing certificate.
Ratings and ReviewsSee All
Don't Waste Your Money
Sunrise/Sunset calculations ARE incorrect... so the question is what else is calculated incorrectly. I tried to make their support aware of the problem but they pretty much blamed me for entering data wrong and blew me off. I may not have a Phd in astrophysics, but I was a Quartermaster in the US Navy for 20 years, so I believe I know how to calculate SR/SS. Kinda hard to go wrong making sure the date is correct, GMT is correct and then entering latitude, click on SUN and click on GO. This program doesn't even deserve the 1 Star.
Developer Response ,
I am very sorry to hear of your experience with StarPilot support. The StarPilot programs including iNA are under new management as of July 1, 2018, and we can promise that all support inquires will be treated with respect and answered promptly and thoroughly. We do not know the details of this inquiry, but we can assure users that the iNA app does compute the times of sunrise, sunset, and twilight times properly. To see various examples worked out, please refer to the app support link, which redirects to a list of specific topics including this one. Or contact us directly for more individual help.
I have returned to teaching and also found the calculations to be in error; specifically as related to a LAN sight that my astronomy group is planning. LAN times are not just off by a little; a 1pm meridian transit is showing up for 2200 regardless of the settings. With the last updat some 4 yrs ago, I suspect that this product has been abandoned.
Latest update broken
The latest update for an Apple cert update has broken the iNA app. I get a screen showing “Unauthorized Copy” over the splash screen.
With Family Sharing set up, up to six family members can use this app.