Re: Umbra recta et umbra versa

for greater accuracy in the calculations. Happy Holidays, Sara Sara Schechner Genuth, Ph.D. Gnomon Research __Curators on Call __Outreach Professionals 1142 Loxford Terrace Silver Spring, MD 20901 301-593-2626 (tel/fax) [EMAIL PROTECTED] Dear all, I am facing an ivory portable altitude

historical sources for some old stories

the Marquis de Lafayette to George Washington in 1777. I've not found concrete evidence for either story. I wonder whether anyone can point me to published accounts, footnotes, documentation, or archival evidence that gives creedence to these stories. Thanks! Sara Sara Schechner Genuth, Ph.D. Gnomon

Re: Portable equatorial sundial

400+ sundials, but will have interpretive essays that offer perspectives on the history, science, and social context of these instruments. Sara Schechner Genuth Gnomon Research Customized Curatorial Services 1142 Loxford Terrace Silver Spring, MD 20901 [EMAIL PROTECTED] Tel/Fax (301) 593-2626

Re: digital sundial

patented, I suggest people contact him at: [EMAIL PROTECTED] Sara Schechner Genuth NASS Secretary Sara Schechner Genuth, Ph.D. Gnomon ResearchTel/Fax: (301) 593-2626 Customized Curatorial Services Internet: [EMAIL PROTECTED] 1142 Loxford Terrace Silver

Sundials in Chicago and Northern Illinois

. Please help us to draw up a list of sundials in the Chicago area or northern Illinois. Thanks for your help! Sara Schechner Genuth NASS Secretary Local Arrangements Co-Chair, 1997 meeting Gnomon Research tel/fax: (301) 593-2626 Customized

NASS 1997 meeting, call for papers

to 500 words) must be submitted by June 1st. To submit an abstract, learn more about the conference, or receive registration forms, please contact: Sara Schechner Genuth, Center for History of Physics, American Institute of Physics, 1 Physics Ellipse, College Park, MD 20740; (301) 209-3166; fax

tides/scratch dials

vespers 3rd hour of compline night etc. The supposed octaval system of time-measurement was never used by the Anglo-Saxons, and arises from confusion in interpreting surviving scratch dials on churches which were used to mark the times of prayer. Sara Sara Schechner Genuth Gnomon

future meeting/call for papers

on all aspects of dialling, including the history, culture, design, fabrication, and science of sundials. Exhibits and short show-and-tell demonstrations are also welcome. Abstracts (up to 500 words) must be submitted by June 1st. For details, please contact: Sara Schechner Genuth, National

future meeting, call for papers

papers on all aspects of dialling, including the history, culture, design, fabrication, and science of sundials. Exhibits and short show-and-tell demonstrations are also welcome. Abstracts (up to 500 words) must be submitted by June 1st. For details, please contact: Sara Schechner Genuth, National

future meeting, call for papers

Forwarded message: From [EMAIL PROTECTED] Mon Feb 3 05:12 EST 1997 From: Sara Schechner Genuth [EMAIL PROTECTED] Message-Id: [EMAIL PROTECTED] Subject: future meeting, call for papers To: [EMAIL PROTECTED], sundial@rrz.uni-koeln.de, [EMAIL PROTECTED] Date: Sun, 2 Feb 1997 23:13:25 -0500 (EST) Cc

universal ring dials and navigation

forthcoming catalogue of sundials and timefinding instruments at the Adler Planetarium, Chicago. For more information about this project, or to be notified about its publication, please contact me.] I hope this helps. Sara Schechner Genuth Committee on the History and Philosophy of Science Department

astrolabes

early notice of their publication and the opportunity to buy copies, may contact me at the address below. Sara Schechner Genuth Editor Department of Historyphone: (301) 593-7144 Francis Scott Key 2115 fax: (301) 314-9399 University of Maryland email: [EMAIL

dial inscription at Oxford

/hooke/ Good luck. Sara Schechner Genuth Committee on the History and Philosophy of Science Department of Historyphone: (301) 593-7144 Francis Scott Key 2115 fax: (301) 314-9399 University of Maryland email: [EMAIL PROTECTED] College Park, MD 20742-7315

ring dial confusion

-finding ** instruments, as well as the Editor of the catalogue series. (It may interest readers to learn that the first two volumes--on eastern and western astrolabes and related instruments--will be published by the Adler Planetarium by next spring.) Sara Schechner Genuth Secretary, North American

Re: Shadow Clock/Sundial Request

? If the latter, how do you define Biblical in terms of time and place? Sara Schechner Genuth Secretary, North American Sundial Society [EMAIL PROTECTED] Committee on the History and Philosophy of Science Department of History University of Maryland at College Park College Park, MD 20742-7315