NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Ho 208 question
From: Stan K
Date: 2014 Feb 24, 16:43 -0500
From: Stan K
Date: 2014 Feb 24, 16:43 -0500
Things don't look too bad now. Here are the values I get for Hc with the various SR methods, using your GPS location, etc. Keep in mind that only the Law of Cosines, the two H.O. 211s, and the third type of H.O. 214 work from the DR position, with the others working from an assumed L and and assumed Lo, with the exception of the second type of H.O. 214, which works from an assumed L and a DR Lo.
Law of Cosines 37º56.1' (agreeing, as expected, with the USNO calculator)
H.O. 211 original 37º56.0'
Law of Cosines 37º56.1' (agreeing, as expected, with the USNO calculator)
H.O. 211 original 37º56.0'
H.O. 211 compact 37º56.0'
H.O. 214 type 3 37º55.9'
H.O. 214 type 2 38º15.3'
H.O. 214 type 1 38º15.5'
Pub. 249 38º15' (only tabulates to whole minutes)
Pub. 229 38º15.5'
H.O. 208 38º15.5'
So, comparing apples to apples, not too bad. Still, the calculated values in 208 could be off a little and still result in a good Hc.
Stan
H.O. 214 type 3 37º55.9'
H.O. 214 type 2 38º15.3'
H.O. 214 type 1 38º15.5'
Pub. 249 38º15' (only tabulates to whole minutes)
Pub. 229 38º15.5'
H.O. 208 38º15.5'
So, comparing apples to apples, not too bad. Still, the calculated values in 208 could be off a little and still result in a good Hc.
Stan
-----Original Message-----
From: Randall Morrow <randall.f.morrow@kp.org>
To: slk1000 <slk1000@aol.com>
Sent: Mon, Feb 24, 2014 4:10 pm
Subject: [NavList] Re: Ho 208 question
From: Randall Morrow <randall.f.morrow@kp.org>
To: slk1000 <slk1000@aol.com>
Sent: Mon, Feb 24, 2014 4:10 pm
Subject: [NavList] Re: Ho 208 question
Stan and Gary,
As always thank you both for your help.
It should have been PST, not PDT so plus 8 is correct.
Using USNO the intercept was 0.3 NM so the sight was very accurate..
I didn't have my almanac here but My GHA total DID include the increment value of 7* 17.7
It was indeed "fatfingers" when I keyed in my first mesage as the SHA I used was the 258* 33.1 valus.
I should add that I shot sights for Mirphak, Dubhe, Regulus Rigel and Aldebaran and each of these gave correct results in the Celestial Tools Ho 208 system.
In the "tools" entry I used my GPS location of 35* 19.4 N, 119* 05.5 W.
As always thank you both for your help.
It should have been PST, not PDT so plus 8 is correct.
Using USNO the intercept was 0.3 NM so the sight was very accurate..
I didn't have my almanac here but My GHA total DID include the increment value of 7* 17.7
It was indeed "fatfingers" when I keyed in my first mesage as the SHA I used was the 258* 33.1 valus.
I should add that I shot sights for Mirphak, Dubhe, Regulus Rigel and Aldebaran and each of these gave correct results in the Celestial Tools Ho 208 system.
In the "tools" entry I used my GPS location of 35* 19.4 N, 119* 05.5 W.
It had not occurred to me that the LHA of zero makes it a "noon" sight. Cool.
This is the only time out of 5067 sights that I got exactly that LHA.
This is the only time out of 5067 sights that I got exactly that LHA.
Kind regards, Randy
----------------------------------------------------------------
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
----------------------------------------------------------------
----------------------------------------------------------------
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
----------------------------------------------------------------
