EZ Celestial Navigation 对比 iMariner Celestial Navigation 的使用情况和统计数据
Celestial navigation has never been easier! With ezAlmanacOne and a sextant you will be finding your fix like a pro in no time!
ezAlmanacOne is an evolution of the iPad version of ezAlmanac with the modern user interface used in the Windows 10 version of ezAlmanac. All of the features of ezAlmanac plus new features including:
- Universal app runs on iPad, iPhone, iPod touch, and the new MacBook with M1 processor.
- Supports all device orientations. All screens support zoom and pan.
- Make bearing observations to perform compass checks.
- Archive saved observations and restore observation data from an archive.
- Includes quick start guide, usage examples, and other documentation to learn celestial navigation.
- Print/Output Nautical Almanac pages, observation reports, and other app documentation.
ezAlmanacOne will help you perform celestial navigation exactly as it has been done for hundreds of years. It produces all Nautical Almanac (1960-2059) and Pub. 229 tables exactly as you are used to seeing them in the printed form. All tables can be accessed directly for manual usage if you choose to do so. Since they are produced by the software they support zooming and panning, and you can highlight in the tables to easily find the correct value to use.
Most users, however, will prefer to let ezAlmanacOne do all of the work. Simply enter the basic sight parameters, make and enter your observations, and ezAlmanacOne will do the rest. It performs all of the steps to correct your observation, find GP of the object, do the sight reduction, and plot the LOP. No steps are skipped and all details are shown. Click where the LOPs cross in the plot and you have found your fix!
Besides finding your fix, ezAlmanacOne is one of the best tools available to perform compass checks from a bearing observation of one of the navigational bodies. The compass check function supports checking up to 5 devices from a single bearing observation. ezAlmanacOne will also create a report of your compass check that can be saved as a PDF file or printed for the ships records.
Celestial navigation instructors love ezAlmanacOne because it does celestial navigation exactly as they teach it. Values obtained from the Nautical Almanac and Pub. 229 are clearly identified with an icon of the book. When you press the book icon you are taken to the page that has that value with the row, column and value highlighted. Even when ezAlmanacOne is doing all the work, it can teach you how to do it manually using the books.
For manual celestial navigation you can generate and print Nautical Almanac pages to use as a backup on a passage. You can even print the sight reduction forms and plotting sheets you will need.
ezAlmanacOne performs all astronomical calculations using the NOVAS 3.1 software from the US Naval Observatory (USNO) and a JPL ephemeris that covers the years 1960 through 2059. It also implements WMM-2020, the latest World Magnetic Model software available from NOAA, to compute magnetic declination. Since all calculations are performed in the software, ezAlmanacOne is fully functional with no dependency on the internet.
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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
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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.
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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
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EZ Celestial Navigation VS.
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十二月 12, 2024