|
|
|
|
|||||
|
||||||
From: Robert Eno (no email)
Date: Wed Jun 15 2005 - 19:15:13 EDT
Gidday Mike,
I agree with you on the need for tenths when taking lunars, however, my only experience in taking lunars -- and I have taken a lot -- is on dry land from a rock-solid platform. In this case, it was useful to be able to read my sextant to the nearest tenth of a minute. But what about taking lunars at sea? I suggest that even for lunars, being able to resolve angles to the 0.1 minute of arc is expecting too much given the circumstances.
Then again, just because it is beyond my capabilities, doesn't mean that there are not a bunch of crack shots out there who can salvage a star sight in a hurricane.
Robert
----- Original Message -----
From: Mike Burkes
To:
Sent: Wednesday, June 15, 2005 3:48 PM
Subject: Re: Drum Sextants
Tenths have their places in Lunars and if observer requires surveyor accuracy all on land of course.
Quick correction on my C.Plath description:
You can resolve the measurement to the nearest tenth when two vernier lines on the fixed portion are bracketed by two vernier lines on the rotating drum.
I got it arse-backwards in my first comment.
|