Re: strange longitude

Dear Gianni, Thanks very much for the hint regarding dialing resources on Google Books! Quite a few of the full view, downloadable, books in pdf format have at least chapters on dialing.  In the mid 1800's it appears that many colleges and universities included dialing as a subject within their

Re: strange longitude - Gianni's note

Frank (King), you wrote : The Plane's Latitude and the Plane's Longitude In John Good's book, the apostrophes seem to be missing and he usually refers to: The Planes Latitude and the Planes Longitude I feel a great need for the apostrophes! You can find the apostrophes in several

Re: strange longitude

Dear Frank (Evans), I don't agree completely on your conclusions :-) In http://books.google.comit is possible to download the book John Good - The Art of Shadows, etc. - London 1731 The PDF version downloaded is 7.0 Mb long andhas 222 pages. In this book the

Re: strange longitude

Dear Frank, You present a splendid summary... The most likely explanation, it seems to me, was proposed by Fer de Vries. Indeed so... In other words, at 9.37 am the sun will be directly over the style and the cited longitude is the hour angle. This explanation has the added advantage

strange longitude

Greetings fellow dialists, At last we seem to be approaching a conclusion for the Hawkshead dial. So many valuable contributions and I am awed, even overawed, at the erudition of our contributors. Among your messages have been three suggestions among the many that looked particularly promising.

Re: strange longitude

Dear Frank all, On the meaning of PI Long: Waugh uses the symbol P in his computational treatment of the declining dial on p. 80. The P values for each hour line in table 10.2 are what Holwell (in Clavis Horologiae, London 1712) calls the polar angles. The polar angle for noon equals the

Re: strange longitude

Dear Frank et al, I note that the letters 'PI' (as well as PII and PW) appear as one of the centres of Oughtred's Horizontal Instrument. They are actually engraved on the instrument made by Elias Allen. Perhaps this is another red herring. Regards, John D

Re: strange longitude

[EMAIL PROTECTED] To: Sundial [EMAIL PROTECTED] Sent: Wednesday, April 25, 2007 9:48 PM Subject: strange longitude Greetings fellow dialists, John Foad has written to say that Keith Scobie-Youngs of the Cumbria Clock Co, Dacre, Penrith, last restored the Hawkshead dial in 1997. He asked

Re: strange longitude

Frank Evans wrote: He [Keith Scobie-Youngs] unfortunately had no information or theory on what the PL Long [Now known to be PI Long] meant, nor indeed as to why the dial is canted to no apparently significant declination! On the matter of the dial being designed as a declining dial yet also

Re: strange longitude

Hi Frank, At the start of this thread you wrote: ** Reference the sundial on the Old Grammar School, Hawkshead, Cumbria, England. The school is a museum, famous as the place of William Wordsworth's education. Over the door is a fine dial dated 1845 with stated co-ordinates, latitude 54

strange longitude

Greetings fellow dialists, John Foad has written to say that Keith Scobie-Youngs of the Cumbria Clock Co, Dacre, Penrith, last restored the Hawkshead dial in 1997. He asked the restorer if there was any clue from its original state, for example whether any of the lettering had been uncertain.

strange longitude

Greetings fellow dialists, So the present position regarding the Hawkshead dial appears to be that it has a longitude reference of close to 36 deg. Hawkshead is almost exactly 3 deg. west of Greenwich. So we are looking for a longitude baseline from Greenwich of either 39 deg. west or 33 deg.

strange longitude

Greetings fellow dialists, Mea culpa and apologies to all. In my initial message I gave the co-ordinates of the Hawkshead dial (Lat 54 deg. 22 min. 10 sec. and PL 35 deg. 43 min. 40 sec.) but omitted to say that between PL and 35 deg. the word Long occurs. I am most reluctant to let go of

Re: strange longitude

: strange longitude I looked with Google ... and I got a picture of the dial... It is an east declining sundial for local suntime and I think the value is the declination of the dial. That thought occurred to me too. In which case PL might be a slightly unusual use of the navigator's term

strange longitude

I have tried to look for the photos of the sundial of the Old Grammar School in Hawkshead that are in internet and I have found: 1 - http://www.visitcumbria.com/amb/hawkgrsc.htm ( la fotografia inviata da Fer de Vries) 2 - in http://www.sundialsoc.org.uk/Dotm/jul2001.htm 3 -

Re: strange longitude

But would anyone claim to measure declination to seconds of arc? Hmmm. That's one reason why I hesitated to make the suggestion but there are three tiny points to note: 1. The meridian line in the Basilica di S. Maria degli Angeli in Rome was laid down in 1702 and that IS true

Re: strange longitude

Dear Gianni, You are truly wonderful! You have, come sempre, solved the problem! We have all these people on the English list wondering about PL and we have to wait for you to interpret our English! I didn't think of the Geocentric Latitude and I certainly didn't think of the Reduced Polar

strange longitude

, formerly Pernambuco, Brazil. No significant place on the coast there (lighthouse, etc) fits but I am wondering if there is or was an observatory in or near the middle of the town. And what can the letters PL mean? Any suggestions for this strange longitude citing? Frank, 55N 1W -- No virus found

Re: strange longitude

to Recife, formerly Pernambuco, Brazil. No significant place on the coast there (lighthouse, etc) fits but I am wondering if there is or was an observatory in or near the middle of the town. And what can the letters PL mean? Any suggestions for this strange longitude citing? Frank, 55N 1W

Re: strange longitude

DAVIS [EMAIL PROTECTED] Date: Sat, 21 Apr 2007 19:37:53 +0100 (BST) To: [EMAIL PROTECTED], [EMAIL PROTECTED] Subject: Re: strange longitude Hi Frank et al, That's an interesting one! I make Hawkshead about 3 deg. W of Greenwich so assuming the second figure is a longitude difference

Re: strange longitude

Longitude? Chris Tom Kreyche Original Message: - From: JOHN DAVIS [EMAIL PROTECTED] Date: Sat, 21 Apr 2007 19:37:53 +0100 (BST) To: [EMAIL PROTECTED], [EMAIL PROTECTED] Subject: Re: strange longitude Hi Frank et al, That's an interesting one! I make Hawkshead about 3

Re: strange longitude

Apr 2007 20:52:47 +0200 To: [EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED] Subject: Re: strange longitude At 20:48 21/04/2007, [EMAIL PROTECTED] wrote: John, Frank -- Is it possible that a prime meridian other than Greenwich was used for some quirky reason? It seems

Re: strange longitude

Message - From: Frank Evans [EMAIL PROTECTED] To: Sundial [EMAIL PROTECTED] Sent: Saturday, April 21, 2007 5:41 PM Subject: strange longitude Greetings, fellow dialists, Reference the sundial on the Old Grammar School, Hawkshead, Cumbria, England. The school is a museum, famous as the place

Re: strange longitude

I looked with Google ... and I got a picture of the dial... It is an east declining sundial for local suntime and I think the value is the declination of the dial. That thought occurred to me too. In which case PL might be a slightly unusual use of the navigator's term Position Line?