[Aztlan] E-Groups and Sundogs

[Scott]

On Wed, Feb 20, 2008 at 06:40:30PM -0800, Robert Hall wrote:

>      Please correct me if I am wrong, but I do not believe that the
>  literature on E-Groups considers the possible relevance of nadir
>  passage of the sun in addition to solstices and equinoxes. 

Sorry, but could you explain to the list, or at least to me, in
astronomical terms, what exactly the "nadir passage of the sun" is? A
quick 'google' for it reveals mainly astrological or new-age sites.

Most importantly, if I were to go out in my backyard, what
observations would I need to make to determine when this 'nadir
passage' occurs at my latitude?

Scott Swanson