-- Fer J. de Vries [EMAIL PROTECTED] http://www.iaehv.nl/users/ferdv/ lat. 51:30 N long. 5:30 E
Message-ID: <[EMAIL PROTECTED]> Date: Mon, 26 Jul 1999 19:16:06 +0200 From: "fer j. de vries" <[EMAIL PROTECTED]> X-Mailer: Mozilla 3.04 (Win95; I) MIME-Version: 1.0 To: [EMAIL PROTECTED] Subject: Re: [gnomonicaitalia] atti del seminario di gnomonica References: <[EMAIL PROTECTED]> Content-Type: text/plain Content-Transfer-Encoding: 8bit gunella wrote: > > > La mia relazione sulle ore planetarie era stata inviata all' Ing. Del Favero > in due forme successive, in quanto la seconda stesura aveva degli elementi in > più che nel frattempo ero riuscito a reperire. > Negli atti tuttavia appare solo la prima stesura. > Per quei quattro gatti interessati al testo definitivo, allego qui il tutto. > Cordiali saluti a tutti e buone ferie. > Magun > > ------------------------------------------------------------------------ > Click Here to apply for a NextCard Internet Visa and start earning > FREE travel in HALF the time with the NextCard [EMAIL PROTECTED] Program. > http://clickhere.egroups.com/click/449 > > eGroups.com home: http://www.egroups.com/group/gnomonicaitalia > http://www.egroups.com - Simplifying group communications > > --------------------------------------------------------------- > > Name: PLANETAR.doc > Part 1.2 Type: application/msword > Encoding: base64 To Alex Gunella, Thank you for your interesting Italian article Planetar.doc. I only can read a little Italian but I understood that you write about 2 timesystems for planetary hours. I would like to add that Joseph Drecker, a German scholar, wrote about these hours in 1925 in his book : Die Geschichte der Zeitmessung und der Uhren, Band I, Lieferung E, Die Theorie der Sonnenuhren. In a note Drecker writes: quote: Sacrobosco ( um 1230 ) definiert : hora naturalis est spatium temporis, in qou medietas signi peroritur ( De sphaera, Paris 1531 ) endquote Drecker also gives a picture how these lines look on an horizontal sundial. According to Drecker these natural hours should be named planetary hours. The hours in the system by which the day is devided in 12 ( equal ) parts should be named antique or unequal hours. In my program suite ( downloadable at my homepage ) is a program ( planuur.exe ) to calculate these hourlines for any flat plane in the world. You can draw a picture on screen how the lines look on a sundial. Best wishes, Fer. PS. If there is someone who can and wants to translate the Italian article into English I would be very pleased to get a copy. -- Fer J. de Vries [EMAIL PROTECTED] http://www.iaehv.nl/users/ferdv/ lat. 51:30 N long. 5:30 E
