I wrote:

Hi Franco--
>

Sorry to mis-write your name--I meant Francesco.

48 W
November 20th
1649 UTC
Michael Ossipoff

On Wed, Nov 20, 2019 at 11:29 AM Michael Ossipoff <email9648...@gmail.com>
wrote:

> My dials will show 9 declination-lines:
>
> 1; Equinoxes, solstices, and half-solstice declinations
>
> 2. Declinations at the ecliptic-longitudes that divide each
> astronomical-quarter (interval between an equinox and a solstice) into
> thirds.
>
> So the dials will indicate solar-declination and solar-ecliptic-longitude
> (expressed in thirds of an astronomical-quarter--the tropical signs of the
> Zodiac, labeled with their traditional astrological symbols for the signs
> of the Zodiac).
>
> The dials will also show Babylonian hours in the morning, and co-Italian
> hours in the afternoon.
>
> The Cylindrical-Equatorial shows h and dec in a clear rectangular format,
> and doesn't need explanation.
>
> The Horizontal Dial or course is the most easily-built stationary dial,
> and is particularly-easily read from any direction by someone who is near
> to it, and tells time whenever the Sun is above the horizon (except if it's
> shaded at some times of day).
>
> A Cylindrical-Equatorial Dial can be built to tell time whenever the Sun
> is above the horizon. The upper edge of the cylinder is trimmed horizontal,
> and the nodus is a bead at the middle of a string transversely across the
> cylinder, with the nodus-bead positioned on the cylinder's axis normal to
> the dial's equator-line.  The nodus-bead is also level with the
> horizontally-trimmed top-edge of the cylinder.
>
> This Cylindricald-Equatorial is similar to the ancient Hemicycleum.
> ...differing from it by using a cylindrical surface instead of a spherical
> surface; using a string-mounted nodus-bead instead of a stick-gnomon (which
> I consider to be an eye-injury-hazard); and not being cut-away as the
> Hemicyclea usually were.
>
> 48 M
> November 20th
> 1628 UTC
> Michael Ossipoff
>
>
>
> On Wed, Nov 20, 2019 at 11:00 AM Michael Ossipoff <email9648...@gmail.com>
> wrote:
>
>> Hi Franco--
>> .
>> I like explanations that can be understood by anyone from at least
>> pre-secondary-school. I believe that such people can understand the sundial
>> and map-projection explanations that I'd use.
>> .
>> To whom would I give explanations?:  Primarily to my girlfriend. She
>> isn't interested in math, but that doeesn't mean that those explanations
>> wouldn't be understandable to her if she's interested in them, interested
>> in lisening to them.
>> .
>> I mentioned to her that our windowsill sundial would be a
>> Cylindrical-Equatorial Dial, because it doesn't need any explanation,
>> because it shows the Sun's position in the most direct way. She replied
>> that she has nothing against explanation of the Horizontal-Dial, its
>> hour-lines and declination-lines, and considers it interesting.
>> .
>> So the first windowsill dial here will be a Cylindrical-Equatorial Dial,
>> followed by a Horizontal Dial.
>> .
>> In general, I believe that these subjects can be explained to anyone who
>> is interested in hearing the explanation.
>> .
>> So I'd offer these explanations to anyone to whom I'd suggest or offer a
>> sundial or map-projection. I like the idea of a sundial or displayed map
>> being accompanied by a pamphlet or a page that tells its
>> construction-formula derivation-explanation.
>> .
>> Some say that people aren't interested in explanations, but I suggest
>> that, rather, they're often just resigned to things being not explainable
>> to them. I believe that, when shown a sundial or map, they'd like it
>> explained.
>> .
>> It seems to me that every park, library, museum, plaza, and other
>> public-spaces, should have a sundial.
>> .
>>
>> ------------------
>>
>> I'm not familiar with those softare products, but I'd have no objecion to
>> their use.  I'd use drawings, but of course that software could be helpful
>> too, showing things in ways other than what a drawing can show.
>>
>> 48 W
>> November 20th
>> 1600 UTC
>> .
>> Michael Ossipoff
>>
>
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