NavList:

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

HOME

Re: Irradiation and manual navigation
From: Henry Halboth
Date: 2010 Mar 11, 21:50 -0800

Hi all,

Isn't it really amazing how we seem to keep re-inventing the wheel. Didn't our "land bound" Professor Chauvenet give us the exact same number, i.e., +/- 10 arc seconds, in an 1868 paper on Astronomy - admittedly, however, he doesn't mention the matter of irradiation. Most of this stuff can be found in the literature of yesteryear.

Just a thought -:).

Regards,

Henry

--- On Thu, 3/11/10, Richard M. Pisko <rmpisko1@telus.net> wrote:

From: Richard M. Pisko <rmpisko1@telus.net>
Subject: [NavList] Re: Irradiation and manual navigation
To: NavList@fer3.com
Date: Thursday, March 11, 2010, 11:01 PM

On Sun, 07 Mar 2010 12:45:12 -0700, Douglas Denny <douglas.denny@btopenworld.com> wrote:

> The results of approximately 1200 measurements made during nine flights confirm results of simulator and groundbased studies which indicate that, with a hand-held sextant, an astronaut can be expected to make navigational measurements with errors having a standard deviation of approximately +/- 10 arc seconds.
> A value for moon irradiance effect of approximately 25 arc seconds was established for the conditions of the experiment using a hand-held sextant.
> ENDS.

To me, this 1/2 minute of arc seems reasonable. Thank you for your further research.

--Richard . . .

Using Opera 10

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: