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Subject: Re: Computing tables
From: Tony (anthonys@XXX.XXX)
Date: Fri Sep 10 1999 - 01:27:42 EDT
"Richard B. Emerson" wrote:
>
> Well, it's possible to compute results accurate to many places even
> though the native word size may be limited. There are some excellent
> integer routines around, too, which offer speed advantages. The point
> here is that a 32 bit processor can give good, long results *if you're
> willing to wait for them*.
No argument there. The wait time can be considerable. The source data
from either USNO or HMNO really is not a limiting factor in 32 bit. It
could well be in resolving sin/cos functions in less precise formulae.
> My question is directed towards knowing
> just how accurate the tables are in terms of identifying systematic
> errors (e.g., rounding errors which propigate forward through a
> series).
This would be academically interesting but of little practical value in
marine navigation, IMO. In any event, I'll leave that to the math heads at
JPL/NASA/DOD who may have greater needs. :-)
Tony
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