iMariner Celestial Navigation4.5 - App Store

iMariner Celestial Navigation is a complete toolbox : sight, fix, meridian, starfinder, solar compass
Also embedded : nautical almanac (sun, moon, planets, starts) and astronomical computation (no more need for HO-249/HO-229 tables)

- displays almanac informations : Sun, Moon, Venus, Mars, Jupiter, Saturn and 92 brightest stars. At this step, you can use these almanac data with HO.249 tables, if you want to reduce manually.

- reduces a sight : getting your observed altitude and the precise time, it calculate Intercept and Azimut. You don't need any calculation ! Simply report Intercept and Azimut to your navigational chart.

- You can save your observations by passages and send them by email in CSV format

- take a fix : with two sights, iMariner is able to calculate your position (latitude/longitude)

- meridian passage : iMariner helps you to take observations mandatory to know your position (latitude/longitude)

- sight preparation : iMariner proposes you the best objects, here position (azimut and elevation), and the approximate time of the day the observation can take (nautical_twilight or nautical dawn).

iMariner is a standalone application. It doesn't require internet connection. It is light and calculations are optimized to save energy on your boat.

Includes a solar compass (and moon compass too).
REFERENCES :

iMariner has been inspirated by astronomical works of the following people.

Brightest Stars Catalog

Extraction of 92 stars > = 2.5 Mag from the vizier catalog, completed with some stars and star names.
V/53A Catalogue of the Brightest Stars (Ochsenbein+ 1988)
This research has made use of the VizieR catalogue access tool, CDS, Strasbourg, France
vizier.u-strasbg.fr
=============================
Le catalogue des etoiles les plus brillantes Catalogue of the brightest stars
Ochsenbein F., Halbwachs J.L. =1987BICDS..32...83O
Ochsenbein F., Acker A., Legrand E., Poncelet J.M., Thuet-Fleck E.
=============================

AlgorithmsFrom the reference book Astronomical Algorithms by Jean Meeus

Planets : VSOP87D theoryTables extracted from ftp://ftp.imcce.fr/pub/ephem/planets/vsop87/ and adapted to Objective-C.

Bretagnon P., Francou G., : 1988, Astron. Astrophys., 202, 309.
Pierre Bretagnon, Gerard Francou Bureau des Longitudes
77, Avenue Denfert-Rochereau F75014, Paris, France

Moon : ELP2000 theory

The lunar ephemeris ELP2000 M. Chapront-Touze and J. Chapront
Service de Mecanique Celeste du Bureau des Longitudes
77, Avenue Denfert-Rochereau F75014, Paris, France
Sky Maps

Free maps from the IAU site : http://www.iau.org/public/constellations/

DeltaT value
maia.usno.navy.mil

Version History More precise stars computation :
Simbad Database from http://simbad.u-strasbg.fr/simbad Centre de Données astronomiques de Strasbourg Observatoire de Strasbourg 11, rue de l'Université - 67000 STRASBOURG, France
Nutations from https://hpiers.obspm.fr/eop-pc/models/nutations IERS EOP PC Observatoire de Paris 61, avenue de l'Observatoire 75014 Paris/ FRANCE 4.5 05/26/2023 Fix crash in iOS 16.4 4.4 05/01/2023 Fix a crash in Star Finder 4.3 01/04/2023 Passage Edit enhancement
Tapping the cell will enter the text edit mode
Tapping the accessory button will got to the sights

Passage Edit enhancement
Update the 'hamburger' Reorder Control color from Gray (default) to white 4.2 11/09/2022 Fixes crash in the mailer. 4.1 02/15/2022 Issue with stars SHA/DEC computing. Code updated to use formulas (12.2), (12.4), (22.2) from [1] to take into account Aberration.
[1] : Jean Meeus. Astronomical Algorithms 1991 4.0 06/03/2021 Bugs correction 3.7 06/02/2019 Meridian calculation issue :
Sailors navigating in Pacific can have a Time1 and Time2 in different UTC days.
This case was not handled in Meridian calculation. 3.6 06/09/2018 New DeltaT value for 2017 : 68.8 3.5 08/15/2017 Time display issue in Star Finder 3.4 05/24/2017 Corrected a color issue in all PickerViews (dates, sights ...) appeared in iOS 10.2 and on iPads. Colors where black on black. 3.3 02/06/2017 Correction of a crash in Sky Charts display, that appear in iOS9 3.2 10/15/2015 Correction of a bug affecting the sight calculation with stars, that appeared first with version 3.0. 3.1 04/12/2015 Meridian calculation : equation of time calculated using current time and not 1200 GMT time (thanks Marco !)
Equations rewritten in standard C for better portability.
Update the value of DeltaT (68s) for 2014 from maia.usno.navy.mil 3.0 09/18/2014 Mistake in fix calculation. Code rewritten. 2.7 04/09/2014 Bug correction in dates (Meridian and Star Finder).
Quick Start Guide available offline (Information tab) 2.6 01/27/2014 Compatibility made with iOS7 and iOS6.1 2.5 11/27/2013 pre-ios7 : this version is corrected to work with ios7. But the look is not yet changed. 2.4 10/31/2013 Update the value of DeltaT (67.4s) for 2013 from maia.usno.navy.mil 2.3 02/14/2013 bug fixes 2.2 05/10/2012 You are the ability to export your sights by email (in csv format).
New computation using vDSP and vecLib : vectorial libraries that greatly increase performance of mathematical functions (VSOP87).
Improved calculation algorithm for Fix determination.
Support for the new iPad Retina : all screens and images, especially Stars Maps, are fully available in Retina quality. 2.1 04/21/2012 2.0 03/20/2012