NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

HOME

Re: NC-2 quirk
From: Peter Hakel
Date: 2010 Jun 6, 10:43 -0700

We normally plot LOPs as straight lines on a Mercator chart but this shift in azimuth is certainly caused by the curvature of the "real" LOP. This effect should be increasingly more prominent with increasing Ho, yet you do see this effect even for Ho near zero. This is an interesting little detail, thanks for bringing it up.

Peter Hakel

From: Greg Rudzinski <gregrudzinski@yahoo.com>
To: NavList@fer3.com
Sent: Sun, June 6, 2010 8:35:25 AM
Subject: [NavList] Re: NC-2 quirk

Jeremy,

One more possibility for an amplitude/azimuth discrepancy is the assumed position used for reduction. A GPS position at the moment of observation is best of coarse. The next time you can perform an amplitude try working it for a set of assumed positions then do the same observation as if it were an azimuth and hopefully the same results will be derived by computer, NC-2, 229 interpolation,and Trig calculator. Shifting the assumed position to a convenient Latitude and Longitude will noticeably shift the calculated azimuth by several tenths.

GRudzinski
----------------------------------------------------------------
NavList message boards and member settings: www.fer3.com/NavList
Members may optionally receive posts by email.
To cancel email delivery, send a message to NoMail[at]fer3.com
----------------------------------------------------------------

Subject:
Author:
Start date:	(yyyymm dd)
End date:	(yyyymm dd)

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

NavList

What is NavList?

Get a NavList ID Code

Retrieve a NavList ID Code

Email Settings

Custom Index

Add Images & Files
Name or NavList Code:	Email:

Name:
	(please, no nicknames or handles)
Email:

NavList ID Code: