Newsgroup: it.hobby.nautica
Titolo: fare a meno delle effemeridi?


Roma
*******************************
Step 1  Working with the Greenwich time and date, calculate the 
number of seconds before (-) or after (+) 1200 1 Jan 2000.  Add 
together the number corresponding to the year and the month.  To that 
sum add 86,400 times the day of the month, 3600 times the hour, 60 
times the minute, and the seconds.  Finally, change the seconds to 
centuries by dividing by 3,155,760,000.
Year ____    Month ____    Day ____    Hour ____    Minute ____   
Second ____
Year                    Month                          
1997 -94,737,600        Jan  0           Jul 15,638,400
1998 -63,201,600        Feb  2,678,400   Aug 18,316,800
1999 -31,665,600        Mar  5,097,600   Sep 20,995,200
2000    -129,600        Apr  7,776,000   Oct 23,587,200
2001  31,579,200        May 10,368,000   Nov 26,265,600
2002  63,115,200        Jun 13,046,400   Dec 28,857,600
2003  94,651,200
Number for the year  ___,___,___
Number for the month  __,___,___
Day ___ x 86,400 =     _,___,___
Hour ___ x 3,600 =        __,___
Minute ___ x 60 =          _,___
Second                        __
Total seconds        ___,___,___ / 3,155,760,000 = 
Centuries             __.___ ___ ___ ___ = T
Step 2  Calculate the GHA of Aries, GHAA, in revolutions.  Remove the
integer part of the number leaving the decimal part.  It can be either
positive or negative.  If it is negative, add 1 to it to make it
positive.  Multiply the revolutions by 360 to convert it to decimal
degrees and if desired to degrees and minutes.
GHAA = 0.7790573 + 36,625.0021390T + 0.0000011T^2 
       - 0.0000122sin(125.0 - 1934.1T) - 0.0000009sin(200.9 +
       72,001.7T) = 
              ____._______ rev.
                _0._______ rev (decimal part)
                 0._______ rev (if negative, decimal part + 1)
                  ___.____ °
                ___ ° ___._ '
Note: The calculation should preserve 12 or more significant digits
until the GHAA is converted to degrees.  This is most easily done by
storing the value of T in the calculator's memory.
          *******ESEMPIO***************
Step 1  Working with the Greenwich time and date, calculate the 
number of seconds before (-) or after (+) 1200 1 Jan 2000.  Add 
together the number corresponding to the year and the month.  To that 
sum add 86,400 times the day of the month, 3600 times the hour, 60 
times the minute, and the seconds.  Finally, change the seconds to 
centuries by dividing by 3,155,760,000.
Year 1998_    Month _2__    Day _15_    Hour _6__    Minute _0__  
Second _0__
Year                    Month                          
1997 -94,737,600        Jan  0           Jul 15,638,400
1998 -63,201,600        Feb  2,678,400   Aug 18,316,800
1999 -31,665,600        Mar  5,097,600   Sep 20,995,200
2000    -129,600        Apr  7,776,000   Oct 23,587,200
2001  31,579,200        May 10,368,000   Nov 26,265,600
2002  63,115,200        Jun 13,046,400   Dec 28,857,600
2003  94,651,200
Number for the year  -63,201,600
Number for the month  _2,678,400
Day _15 x 86,400 =     1,296,000
Hour _5_ x 3,600 =        21,600
Minute _0_ x 60 =          _,__0
Second                        _0
Total seconds        -59,205,600 / 3,155,760,000 = 
Centuries             -0.018 761 122 5__ = T
Step 2  Calculate the GHA of Aries, GHAA, in revolutions.  Remove the
integer part of the number leaving the decimal part.  It can be either
positive or negative.  If it is negative, add 1 to it to make it
positive.  Multiply the revolutions by 360 to convert it to decimal
degrees and if desired to degrees and minutes.
GHAA = 0.7790573 + 36,625.0021390T + 0.0000011T^2 
       - 0.0000122sin(125.0 - 1934.1T) - 0.0000009sin(200.9 +
       72,001.7T) = 
              -686.3470982 rev.
                -0.3470982 rev (decimal part)
                 0.629018 rev (if negative, decimal part + 1)
                  235.0447 °
                235 ° 02.7 '
--
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Salve a tutti, proviamo di nuovo a far salire un po' di tono questo 
Bravo e grazie.
Memorizzato il tuo mex per usarlo in tempi migliori - ora troppo
lavoro mi opprime.
La rivista francese Bateaux è ricca di informazioni in merito, in
particolare il numero speciale edito annualmente col nome SKIPPER
XX dove xx sono le cifre dell'anno di pubblicazione.
Io ne possiedo un paio... 95 ... 96.
Durante vacanze natale vedo di sfogliarli e se trovo qualche cosa
ti avviso.
Greetings from.... Walter
Milano - Italy
wal...@wpavesi.com
www.wpavesi.com


Rome, Italy
