NavList:

Here is a crystal clear example contrary to Mr. Reed's assertions.

Your Latitude N16 degrees 32.1 minutes
Your Longitude W72 degrees 0 minutes

Date 4April2014

Celestial Object Observed: Aldebara

Data From the same USNO Site

Time 20-32-24 Hc 89 deg 59.7 minutes Zn 98 degrees
Time 20-32-25 Hc 89 deg 59.9 minutes Zn 127 degrees
Time 20-32-26 Hc 89 deg 59.8 minutes Zn 257 degrees

Note the altitude is changing more than 0.1 PER SECOND, contrary to the generic assertion.
Note the azimuth is changing rapidly PER SECOND, contrary to the generic assertion.

Yes, I carefully hand crafted this example to demonstrate the volatility of the data. With careful attention to date, time and latitude, the sun can be made to do this as well. Its just an extreme example, used only to contradict generic assertions. This observation would be near impossible to 'get right' nor actually possible with an artificial horizon.

I stand by my statement that the question needs more clarification to provide a better answer to what is 'good enough'. What Body? What Tolerance? Using Lewis and Clark methods? What inputs? What outputs? What purpose?

I was hoping to elicit the clarification from Greg, to aid in his understanding by more carefully formulating his question.

That didn't happen.

Brad

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