Astronavigation - sextant sights (Celestial Navigation): how to calculate altitude and azimuth using a free and intuitive spreadsheet (excel).

How to calculate altitude and azimuth using a free and intuitive spreadsheet (excel)

..after having collected all the data : estimated latitude and longitude, declination / local hour angle of the observed celestial bodies (stars, sun, moon and planets ) and sextant reading (altitude) ..we must calculate at least four data. We’ll use these to plot lines of position (LOP) on a nautical chart, plotting work sheet, or a simple graph paper to determine the position of the ship.

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The data we need are : true altitude, LHA/declination, computed (estimated) altitude and azimuth

We can use this simple excel file to verify (or avoid) the manual calculations !

The file consists of four worksheet.

To prevent damages in cells containing formulae the worksheets are protected and cells are locked, we may use the unlocked cells only (green background).

When we open Excel, Excel automatically selects “Corrections to a sextant obser. “. for us. (The name of the worksheet appears on its sheet tab at the bottom of our document window.)

Example

On January 17th 2016 a Deck Officer takes and records the following sight :

• Sun ( lower limb ) - sextant altitude 29° 53,5’ at 12h 23m 45s U.T.
• DR position : Latitude 38°34,2’ North – Longitude 005°32,7’ East
• Height of eye above the sea level : 2,5 meters
• Sextant is affected by errors. Corrections: +0,5’ instrument error (eccentricity) and -1,4’ index error

First of all we convert the sextant altitude to observed altitude using “Corrections to a sextant obser. “ worksheet :

From the Nautical Almanac – January 17^th 2016 :

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at 12.00 U.T. :

• GHA 357° 31,2 v correction : -0,2’
• Declination 20° 47,5’ S d correction : 0,5’

We calculate LHA and declination using “LHA – declination “ worksheet :

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We solve the formulae of celestial navigation calculating computed (estimated) Altitude and Azimuth using “Altitude - Azimuth“ worksheet :

Difference of altitude = true altitude – computed altitude: 30° 04,5’ – 30° 02,6’ = + 1,9’

Free Download Celestial Navigation Calculator

Now we can draw the graph:

The last worksheet is named “ meridian altitude “. It allows to obtain the latitude after having insertered the meridian altitude and declination.

example:

Celestial Navigation Calculator Free Online

We have a true altitude at meridian passage of 58° 43,6’ and a declination of 23° 04,9’; N the latitude is 54° 23,3’ North.

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Celestial Navigation Programs For Calculators

© 2006-2019 nauticalalmanac

Free Celestial Navigation Calculator

Calculate and display, in textual form, Greenwich hour angle, declination, height computed and azimuth of the 57 navigational stars as listed in the Nautical Almanac, the four navigational planets, Venus, Mars, Jupiter and Saturn, the Sun and the Moon. Additional full data is shown for Polaris and the GHA of Aries. Additionally, calculated and displayed are corrections, that is refraction, apparent semidiameter, parallax, and the sum of these for aiding in correcting sights of the bodies taken by a sextant. Data is calculated for arbitrary assumed position on earth that can be entered as latitude and longitude in units of degrees, arcminutes and tenth of arcminute. All positional data is displayed as degrees, arcminutes, and tenth of arcminutes. Data is shown, except for Aries, if the respective body is above the horizon, regardless of the usability for observation. Data is calculated for current system time what is converted and displayed as universal time. Arrangement of data is to match closely that found on (external link) http://aa.usno.navy.mil/data/docs/celnavtable.php and the notes given there mostly apply to this app. The source of the data is the Bright Star Catalog of 2017 and Jet Propulsion Laboratory’s DE241 development ephemeris. For calculation, the software package NOVAS C3.1 from U.S. Naval Observatory is used. This app does not do anything more. No internet connection, no up- or downloads, no usage of your position data, no advertising or anything the like. Just calculate and display. THERE IS NO GUARANTEE FOR ANY OF THE DISPLAYED INFORMATION, NOR FOR THE WORKING OF THE SOFTWARE AT ALL. DONT USE THIS SOFTWARE AS A SOURCE FOR NAVIGATION. UPDATES - This app does not talk to the store or to Microsoft. Thus, you should proactively check at the store for getting updates. This is just the first edition of a whole series, there is more to come. FEEDBACK - Any feedback, ratings, comments, or feature requests are very welcome. Please submit such to the store. We would like to make this app better for you. The more feedback you give, the more we are encuraged to spend our time on this app. RELEASE NOTES - This release, 1.1.0.11 as of 2017-05-21, fixes a minor bug that caused rare crashes and updates the description. FURTHER RELEASES PLANNED - The next major release planned before autumn 2017 will include all ~ 170 stars listed in the almanac in addition to the stars known as the '57 navigational stars'. And, yes, there will be a star chart, but that'll last a little longer. Copyright deepcomputing.de