terça-feira, 19 de abril de 2016

STELLA (System To Estimate Latitude and Longitude Astronomically) - My favorites quotes from the famous Bowditch 21


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"U.S. Naval navigators have access to a program called STELLA (System To Estimate Latitude and Longitude Astronomically; do not confuse with a commercial astronomy program with the same name). 

STELLA was developed by the Astronomical Applications Department of the U.S. Naval Observatory based on a Navy requirement. The algorithms used in STELLA provide an accuracy of
one arc-second on the Earth’s surface, a distance of about 30 meters. While this accuracy is far better than can be obtained using a sextant, it does support possible naval needs for automated navigation systems based on celestial objects.

These algorithms take into account the oblateness of the Earth, movement of the vessel during sight-taking, and other factors not fully addressed by traditional methods.

STELLA can perform almanac functions, position updating/ DR estimations, celestial body rise/set/transit calculations, compass error calculations, sight planning, and sight reduction. 

On-line help and user’s guide are included, and it is a component of the Block III NAVSSI. Because STELLA logs all entered data for future reference, it is authorized to replace the Navy Navigation Workbook.

STELLA is now an allowance list requirement for Naval SHIPS, and is available from:

Superintendent
U.S. Naval Observatory
Code: AA/STELLA
3450 Massachusetts Ave. NW
Washington, DC, 20392-5420."

CHAPTER 20 SIGHT REDUCTION

BOWDITCH

THE AMERICAN PRACTICAL NAVIGATOR



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