Hello Linda and all,
Yes, this is all it takes, the combination of an analemmatic dial and a
horizontal dial provide a quick determination of true north and true (solar)
time. Many old pocket dials, the size of today's smart phones, provided this
information. What goes around comes around. People still need to no the time
and direction, so easily provided by the analemmatic horizontal dial
combination in a simple flip dial.
Regards, Roger Bailey
--------------------------------------------------
From: "Linda Reid" <[email protected]>
Sent: Friday, July 04, 2014 6:06 PM
To: <[email protected]>
Subject: Re: sundials in schools
In message
<6fdf1b3f189fbd5c34dc9ac34702c0da.squir...@webmail.dickkoolish.com>
[email protected] wrote:
There are astronomy programs like Stellarium and
smartphone apps that give the azimuth of the sun
at a given time. That and a protractor will give
you true north.
An EASY way, will be to use a 'combined' Horizontal AND Analemmatic dial.
You just rotate this, until it shows the SAME time on BOTH dials - which
then means that it is AUTOMATICALLY aligned in the North/South direction.
No need for any computer 'Apps' - although you would need some sunshine!
Hope this is of some help - Linda Reid.
> I would also love to see sundials in schools. Not just an analemmatic
> dials
> but the multi dial as well.
>
> This is why I am trying to find an easy way to find north.
>
> I would like to be able to use a horizontal dial and rotate it until
> it
> reads the true time. Obviously this won't work with a standard
> horizontal
> dial because we are not all on the same longitude. The other reason is
> the
> equation of time.
>
> However, I believe it would work if there was a website that calculate
> setting your watch to LAT instead of LMT. This website would have to
> take
> in account the longitude as well as the day of the year it is. You then
> rotate the sundial until it is the correct time on your watch.
>
>
>
> Cheers
> Donald Christensen
> 0423 102 090
> www.sundialsforlearning.com
>
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