NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: 2102-E Star Finder, Rev 9
From: J Tiffany
Date: 2009 Mar 4, 04:25 -0800
From: J Tiffany
Date: 2009 Mar 4, 04:25 -0800
Hi Brad, Wonderful ! It is completely useable as far as I checked it. A couple of small tweaks still needed: 1) In Southern Star Base, LHA=1 is displaying as LHA=361. It is counting up 359, 360, 361, 2, 3, 4. The N. Star Base is OK. 2) The Sun is still at the VE on March 19 (Day of year=78) instead of March 20 (Day 79). Moving the sun out of the way and looking very close, I detect that the ecliptic is not intersecting the equator exactly at the LHA=0 (VE). In Northern Star Base view the intersection is just left of the VE about one degree. Try this: Set Northern Star Base, set LHA=0, set star rotation to zero (slider to left). Now move the sun away from the VE so that it doesn't cover up the equator/ ecliptic intersection. Set latitude to 35 D N so it doesn't interfere with the view of the intersection either. Now grab the lower right corner of the graph and stretch it further down and right to increase the size (I also took a screen shot and blew it up large to see this up close). If you look close, you can see that the ecliptic intersects the equator to the left of LHA=0. It should intersect exactly at LHA=0. So I think that you may have the position of the sun on the ecliptic correct, but that you need to re-orient the actual ecliptic itself 1 degree clockwise with respect to the stars (when viewing in N. Star Base). If the sun moves along with the ecliptic when you do this, then the sun should be in the right place on day of year=79. 3) Right now I am counting the altitude and azimuth lines, which is not too much trouble (actually it is good practice in counting by tens, which I haven done much of since the first grade; glad I haven't forgotten how!), but some numbers on the blue template would be welcome. 4) If you can manage it, would love to see the red template (with numbers, if possible) , and ON/OFF buttons for both templates, so the user can select to display either or both together. The red template should look a lot like the blue template at the 90 degrees latitude view, except that it extends beyond the equator to cover the whole Star Base (to the "outer limits" as you described earlier), so shouldn't be too big a challenge considering what you've done so far. Since we can't plot a planet on the graph with the mouse (or so I surmise, with Excel's limitations), this would be mainly for teaching the 2102-D I think, and for the sake of completeness in replicating the 2102-D. Any other input from Navlist? Regards, John Tokyo, Japan --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---