NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Borrowed Bygrave
From: Gary LaPook
Date: 2016 Jan 15, 18:26 +0000
From: Gary LaPook
Date: 2016 Jan 15, 18:26 +0000
Nope I can't since that is the only website I have. I only set it up in response to the wild claims made by TIGHAR about where Earhart ended up, TIGHAR has made a lot of money from contributions from a gullible public out of those claims with the head guy paying himself $238,000 a year out of his "tax exempt non-profit" which rubbed me the wrong way." gl -------------------------------------------- On Fri, 1/15/16, Tom Sultwrote: Subject: [NavList] Re: Borrowed Bygrave To: garylapook@pacbell.net Date: Friday, January 15, 2016, 7:57 AM Can you send your website? Tsult---.com. When I google you I find lots of your stuff about Amelia Erhardt but a general website I do not find. Tom Sult, MDAuthor: JUST BE WELLjustbewell.info On Jan 15, 2016, at 03:57, Gary LaPook wrote: If you read the rules for special cases in these photos of the Bygrave you will find that CPT Bygrave tells us how to compute the altitude when the declination is less than the lowest number on the scales. He tells us that to find the altitude in this case that you interchange the declination and the assumed latitude since the astronomical triangle works from both ends, the altitudes, as calculated from either end (GP or AP,) must be the same. BUT, he doesn't tell us how to find the azimuth! I had to invent a method for this situation and it is on my website.==============================================================================================When declination is less than one degree you can't begin the computation the normal way to find "W" because you have to start the process with declination on the cotangent scale and this scale doesn't extend below 1º. So in this case you just skip the computation of "W" and simply set "W" equal to declination. Using this method you arrive at an azimuth that is not exact but is a close approximation and in the worst case I have found the azimuth is still within 0.9º of the true azimuth but most are much closer. If the declination is less than one degree and the latitude is also less than one degree, follow this procedure and also assume a latitude equal to one degree. After you have computed the Az you then follow the same procedure discussed above for azimuths exceeding 85º by interchanging the latitude and declination and then computing Hc which will produce an exact value of Hc. ==================================================== gl From: Gary LaPook To: garylapook---.net Sent: Thursday, January 14, 2016 6:47 PM Subject: [NavList] Re: Borrowed Bygrave i took these photos at the Science Museum in London.gl Attached File: (BygraveInstructions0001.jpg: Open and save) Attached File: (BygraveInstructions0002.jpg: Open and save) Attached File: (BygraveInstructions0003.jpg: Open and save) Attached File: (BygraveInstructions0004.jpg: Open and save) Attached File: (BygraveInstructions0005.jpg: Open and save) Attached File: (BygraveInstructions0006.jpg: Open and save) Attached File: (BygraveInstructions0007.jpg: Open and save) Attached File: (BygraveCorrections0001.jpg: Open and save) Attached File: (BygraveCorrections0002.jpg: Open and save) Attached File: (BygraveCorrections0003.jpg: Open and save) Attached File: (227728364_o.jpg: Open and save) View and reply to this message View and reply to this message View and reply to this message