NavList:

Good "early day" to you Geoff ...

... easy for us ! When you get up, I go to bed and the other way around.

We are only 12,756.274 km (= 2 * 6,278.137 km) apart after all.

Thank you very much for your very kind, detailed and comprehensive reply.

Maybe one last request then if you do not mind ...

Would you be so kind as to process the "other" Lunar by Donald B. Prentice.

With the relevant data hereafter :

Oct 23rd, 1924, TT-UT = +23.7s , from Ladd Observatory at N41°50'15.6" / W071°23'59.26" elev. +69 m above the WGS84 ellipsoid, T=31°F and QFE=29.9" and Regulus Immersion at 10h58m23.0s TU as per his observation.

What would be SWE result here ?

Since my Lunar Distances Program - the one I am using for Occultations too - has a "blind computation zone" of +/- 2 to 3 seconds around the exact time, I have found a different way to very accurately check the effect of refraction / no refraction onto occultations. And as regards such possible effect ... I have become more and more confident now that the only relevant factor is the Parallax induced refraction earlier addressed. Although most often insignificant, under extreme cases - e.g. grazing occultations - it can become significant.

Nonetheless, this is a personal viewpoint which I would be quite happy to see challenged with good and sound arguments.

The name of the game is simply : "what is the [astronomical] truth here", and not : "who is right / wrong ?".

Thanks again,

Kermit

Ps : Your Country New Zealand is MAG NI FI CENT !