Next message: Jim Thompson: "Re: Predictor for moon alt/az at twilight?"
Jim wrote:
>>On page 280 of the Nautical Almanac (2004): "If an error of 0.2' is
>>significant (then the) expression for the parallax in altitude
>>for the Moon
>>should include a small correction OB for the oblateness of the
>>Earth..."
Frank replied:
> I realize that you're aware of this, but just to be doubly sure
> it's worth noting that that correction in the NA is the
> oblateness for an observed altitude only. For lunars, where the
> arc is measured at an angle across the sky, the correction is a
> little different.
I was not clued into that. Thanks for pointing it out, Frank.
Jim
