NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Longitude by lunars during solar eclipse
From: Peter Hakel
Date: 2015 Apr 23, 17:57 +0000
From: Piero Neuhold <NoReply_Neuhold@fer3.com>
To: pmh099@yahoo.com
Sent: Tuesday, April 21, 2015 8:36 PM
Subject: [NavList] Re: Longitude by lunars during solar eclipse
From: Peter Hakel
Date: 2015 Apr 23, 17:57 +0000
Piero,
I am currently on travel, I will look into your question after I get home.
Peter Hakel
From: Piero Neuhold <NoReply_Neuhold@fer3.com>
To: pmh099@yahoo.com
Sent: Tuesday, April 21, 2015 8:36 PM
Subject: [NavList] Re: Longitude by lunars during solar eclipse
Hi Frank ,
actually I used the excel file lunar_distance.xls as mentioned in the attached manual [*], after usual corrections due to T and pressure. My data :
date = 3/20/2015 , 9h 2' GMT ; T=14° , p = 1021.4 mb ; elevation = 18. m ; sun low-limb ( sextant measurement ) = 38.° . GHA and declination from your nautical almanac . As the moon covered a large upper portion of the sun I assumed a lunar distance ( center to center ) of 1° .
date = 3/20/2015 , 9h 2' GMT ; T=14° , p = 1021.4 mb ; elevation = 18. m ; sun low-limb ( sextant measurement ) = 38.° . GHA and declination from your nautical almanac . As the moon covered a large upper portion of the sun I assumed a lunar distance ( center to center ) of 1° .
Since the excel wants far limb or near limb lunar distance I put in input , as near limb , 30' . Anyway I point out that "Easy lunars" ( in your web ) writes "This method is also prone to error when the lunar distance itself is below 15 degrees" .
Thanks a lot for your helping .
[*note from FER: the "attached manual" mentioned above was from Peter Hakel's navigation spreadsheets. Since it was irrelevant to this question and also carries a copyright notice, I have removed it]
