Marcuz ® 30-Aug-2020 07:31

Nautical Almanac's Nautical Starfinder

Year: 2017
Developer: UNKNOWN
Platform: Windows
System Requirements: Microsoft Excel 2017 or Higher
Localization: english
Crack: Not needed
Description: The astronomical observations of the stars aimed at determining the ship point are carried out during nautical twilight in the morning and in the evening. The heights of the stars must be measured in the shortest possible time in order to avoid errors in the transport of the lines. These are due to the inaccurate estimate of the ship's speed. In particular, in the morning, we try to delay observation as much as possible in order to benefit from a horizon that is improving with the passing of the minutes without however letting the stars escape, which tend to disappear.
The success of the astronomical observation fundamentally depends on the study and the appropriate choice of the stars that will be the object, first of the measurements with the sextant, then of the calculations. It is also necessary to establish the exact sequence of observations.
In the morning we begin to observe the stars that first disappear from our view due to their lack of brightness (low magnitude) or their position in the sky near the horizon where the Sun tends to look out (East). In the evening, however, the brightest stars (high magnitude) and closest to the east are immediately sought. It is in the east that we begin to see the first stars and to notice a worsening of the horizon line; this is why we try to anticipate observation as much as possible.
It is necessary to identify the star, with the binoculars of the sextant, when it is not yet possible to the naked eye. To make this happen it is necessary to set the height of the celestial body on the sextant with a certain precision. This can only happen if you are using a Starfinder; this made in excel is of absolute precision.
In order to determine in advance the heights and azimuths of the stars, the navigator in recent decades has used traditional instruments such as the Del Pino spheroscope or the Starfinder 2102-D. The first, no longer on the market, guaranteed good accuracy of the data: the maximum difference between the indicated height and the actual one was about 2.5 degrees in the most unfavorable case. Therefore it was always possible to quickly locate the star in the sky. Using the Star-Finder 2102-D the maximum deviation inevitably rises to 5 degrees!
It is also for this reason that the “StarFinder” was created in an excel and free version: the accuracy of the data is close to 0.1 '. The heights and azimuths indicated in the file are nothing more than the estimated height and azimuth that are obtained at the end of the laborious calculations that follow the astronomical observation!


Star-find-2007 Binary - ENG.xlsb


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