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At the iphone apps store you can get pUniverse it does this very
thing.  Using the compass and the gps data, you put the star in the
cross hair and it names it
Thomas A. Sult, MD
IntegraCare Clinic
www.icareclinics.com
tsult@mac.com




On Nov 2, 2009, at 11:28 PM, Lu Abel wrote:

>
>
>
> frankreed@HistoricalAtlas.com wrote:
>> And now we just need someone to write some applications that
>> feature the celestial navigation data prominently. This could
>> inspire a really dramatic increase in the number of people who are
>> interested in celestial navigation.
> Ah, yes, I can see it now.  I point my iPhone at a celestial body.
> Between the built-in compass and the built-in GPS and the built in
> tilt-angle sensor, it figures out what body I'm pointing at and
> quickly
> uses the tilt angle (accurate to 0.1 minute, of course) to do a quick
> celestial reduction to generate a LOP.   Do it several times and
> there I
> have it, my position!
>
> Hey, all I need is a built-in gyro (maybe one of those laser ones) and
> I've also got a DR position!
>
> (Hmmm, wasn't all this part of a "sextant for the 21st century"
> discussion a while back? -- just point and shoot??   Then I wouldn't
> need to use a GPS will all that untrustworthy electronics :-) )
>
> While a "traditional" GPS doesn't necessarily have or need a built-in
> compass, if one thinks about it for a moment one realizes that
> automotive navigational systems DO need a built-in compass.   Else if
> you punch in an address while parked, how would they know whether or
> not
> to make the first instruction "make a U-turn?"
>
> >


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