NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
A distinction between constant and systematic error
From: Peter Fogg
Date: 2007 Apr 25, 18:29 +1000
From: Peter Fogg
Date: 2007 Apr 25, 18:29 +1000
During recent postings on this topic I failed to make a distinction between constant and systematic error. Some error is constant. Error in time is an example, as could be a consistent error in measuring or recording altitude. Other error can be systematic although its effect is not constant. An error in applying a measurement of temperature or air-pressure is an example of error that is systematic although the effect on calculated refraction will vary, according to altitude. Similarly, if the pivotal point of the sextant arm is not exactly central this will generate error according to the sine of the angle of rotation - again; it is systematic although not constant. --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---