NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Certain Errors in "Certaine Errors".
From: Gary LaPook
Date: 2007 Dec 11, 16:56 -0800
From: Gary LaPook
Date: 2007 Dec 11, 16:56 -0800
Gary LaPook responds:
Well, that didn't help.
The reference describes the making of an analemmatic sundial which is what I had previously understood about analemmas in addition to the figure, usually on globes and world maps, showing the position of the sun throughout the year, shaped like an elongated "figure 8." It also uses the term "planisphere" as an equivalent to Ptoemy's analemma which consisted of a circle and a carpenter's square. That was my original question, did he mean "planisphere?"
I am familiar with planispheric astrolabes, the most ubiquitous of which today are called Weems & Plath 2102-D star finders.
Assuming then that Mr. Prinz was using analemma as the equivalent of planisphere (which is what Wright calls it) I will try to follow his explanation for this method of solution tonight.
gl
Ken Muldrew wrote:
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Well, that didn't help.
The reference describes the making of an analemmatic sundial which is what I had previously understood about analemmas in addition to the figure, usually on globes and world maps, showing the position of the sun throughout the year, shaped like an elongated "figure 8." It also uses the term "planisphere" as an equivalent to Ptoemy's analemma which consisted of a circle and a carpenter's square. That was my original question, did he mean "planisphere?"
I am familiar with planispheric astrolabes, the most ubiquitous of which today are called Weems & Plath 2102-D star finders.
Assuming then that Mr. Prinz was using analemma as the equivalent of planisphere (which is what Wright calls it) I will try to follow his explanation for this method of solution tonight.
gl
Ken Muldrew wrote:
On 11 Dec 2007 at 15:25, glapook@pacbell.net wrote:Gary writes: Did you mean "planisphere" and not "analemma"? All I can find about analemmas is that they relate to sundials.No, he meant analemma (or analemmata). Here is a link that gives some further info: http://www.longwoodgardens.org/docs/analemma.pdf Ken Muldrew.
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