Nautical Astronomy - celestial navigation - altitude formula - calculation Azimuth sun and stars

	celestial navigation - software and formulas to calculate the estimated altitude and azimuth of a fixed star after having collected all the data : estimated latitude and longitude, declination / polar angle of the observed celestial bodies (stars, sun, moon and planets ) and sextant reading (altitude)
home page english version The Nautical Almanac of the Stars

You can download and use this excel file ( it's free ! )

a view of the opened excel file :

How to use the nautical astronomy formula in this file

You have to insert :

latitude and longitude (degrees- minutes-seconds) "n" for north latitude, "s" for south latitude, "w" for west longitude, "e" for east longitude
star declination : (degrees- minutes-seconds) "n" for north declination, "s" for south declination
polar angle : (degrees- minutes-seconds) , "w" or "e" according to the polar angle
true altitude . : altitude observed with sextant (degrees- minutes-seconds) corrected (instrument errors, refraction, and special corrections for sun and moon and so on)

You obtain :

nautical astronomy formulas
formula estimated altitude			sine altitude = (sine latitude * sine declination) + (cos latitude * cos decl * cos polar angle)
formula azimuth			cotg azimuth = ( cotg ( 90-decllination) * cos latitude * cosec polar angle ) - (sine latitude * cotg polar angle )

I'll be happy to receive observations or greetings

celestial navigation - software and formulas to calculate the estimated altitude and azimuth of a fixed star