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Sunrise / Sunset

aLf
in ISY994

Featured Replies

Posted

Just a simple "hows it work" question...

 

I have several fairly elaborate computer programs that arrive at (their) times for sunrise and sunset for an exact Lat/Long, (aviation thing). Each one comes up with a time within 3-4 minutes of each other. ISY included. None of them agree. When you guys programmed ISY, how did you come to the figures that ISY spits out per my Lat/Long? It really doesn't make a hill of beans when you are within a few minutes, I just wonder why a computer algorithm would vary so much from one vendor to the next.

 

Oh and by the way, I have taken my hours and minutes of degrees down to five decimal points. Example, N 42.32.28, W087.51.22 equals, N 42.53800 W087.85367

 

Again, only an inquiring mind. :twisted:

 

aLf

Hi aLf,

 

The algorithm is from NOAA.

 

With kind regards,

Michel

 

Just a simple "hows it work" question...

 

I have several fairly elaborate computer programs that arrive at (their) times for sunrise and sunset for an exact Lat/Long, (aviation thing). Each one comes up with a time within 3-4 minutes of each other. ISY included. None of them agree. When you guys programmed ISY, how did you come to the figures that ISY spits out per my Lat/Long? It really doesn't make a hill of beans when you are within a few minutes, I just wonder why a computer algorithm would vary so much from one vendor to the next.

 

Oh and by the way, I have taken my hours and minutes of degrees down to five decimal points. Example, N 42.32.28, W087.51.22 equals, N 42.53800 W087.85367

 

Again, only an inquiring mind. :twisted:

 

aLf

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