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Re: Polaris SHA
From: Bill B
Date: 2008 Sep 19, 23:22 -0400
From: Bill B
Date: 2008 Sep 19, 23:22 -0400
Bill wrote: >> I did not expect SHA to vary so much and move up and down from year >> beginning to year end. I regarded SHA as an angular distance from the first >> point of Aires. While the reference point changes with precession, the >> relationship to the reference point remains relatively constant noting the >> change of relationships due to proper motion and shifts (relativity) from >> the Earth moving at nominally 70,000 mph around the Sun and their >> relationships to the celestial sphere you have mentioned in the past. >> >> If I read you correctly, any small changes in the relationships between the >> stars (for many reasons) that might seem minor on a star ball or a >> conceptual celestial sphere are magnified by the coordinate >> construct/system. >> Michael Dorl responded: > Does it make sense to think of it this way? Any point close to the > coordinate system origin > can experience large relative coordinate shifts when the origin is moved. Clearly NOT ;-) Bill B. --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
