> I got the following results from the posted data using my program. Does it come close to your results. I wonder if I need to improve the accuracy. I don't see anything in your program run that specifies the elevation above sea-level (the Geoid, or whatever), so presumably your program is assuming sea-level. That indeed would have a significant effect on accuracy! > ... and an elevation of 202.5 meters. > I should have added 31 meters to the latter, because I believe SkyMap treats elevation as distance above the WGS84 ellipsoid, rather than above the Geoid; locally, the Geoid is 31 meters below the ellipsoid: http://earth-info.nga.mil/GandG/wgsegm/intptW.html Consequently, SkyMap shows the MCC track very slightly above the center of the solar disk. I spent what seemed like the entire day yesterday in an email debate about whether or not to add or subtract Geoid heights. By the time I'd gotten the other fellow on the same page as me, evidently I'd succeeded in confusing myself! At any rate, I believe I should have subtracted 31 meters from the elevation before handing it off to SkyMap, which would have slightly (further) raised the MCC track above the center of the solar disk. ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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