Thanks Kurt, This will help me a lot, really appreciate it. Cheers David On 2009-02-23 02:55, Canopus56 wrote:

Replied offline: Consistent with the practice back in the days of Visicalc, Supercalc, Multiplan and Lotus-1-2-3, the formulas [in Sinnott's article] are listed in a table on the second page. I could not find an online spreadsheet, so I hand-typed the formulas into the Excel spreadsheet that you downloaded. Enjoy Kurt

P.S. - Chris Lord also has an extensive of papers - but they are pretty hard to follow:

http://www.brayebrookobservatory.org/BrayObsWebSite/HOMEPAGE/BRAYOBS PUBLICATIONS.html

True Polar Alignment for an Observatory Class Equatorial http://www.brayebrookobservatory.org/BrayObsWebSite/HOMEPAGE/PageMill_Resour... POLE ALIGNMENT.html/TRUE_POLE_ALIGNMENT12.html