Subject:
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RE: Eclipse ideas
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 12 Aug 1999 21:24:43 GMT
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Original-From:
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Hall, Duncan <DUNCAN.HALL@EXNZ01.EXCH.EDS.COMstopspammers>
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Reply-To:
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duncan.hall@ieee.orgSAYNOTOSPAM
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Viewed:
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689 times
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While this suggestion will track the sun in right ascension (more or less),
a further challenge is to craft the tracking mechanism to follow the sun's
apparent annual figure '8' motion in declination as it travels along the
analemma (see http://www.uwm.edu/~kahl/Images/Weather/Other/analemma.html
for more details) ...
Duncan Hall
duncan.hall@ieee.org
> -----Original Message-----
> From: Dallas C. Hockley [SMTP:hockleyd@cybersurf.net]
> Sent: Friday, 13 August 1999 05:01
> To: lego-robotics@crynwr.com
> Subject: Re: Eclipse ideas
>
> Laurentino Martins wrote:
> >
> > Any ideas how to track the sun trajectory using some gears and one RCX?
>
>
> The trick would be getting the gear ratio and timing right. You need to
> step the rotation speed down to 1 rotation every 24 hours, to equate to
> the sidereal motion. If you've seen an equatorial mount for a
> telescope, that's what you're looking for.
>
> Basically, you elevate a platform to the angle of your latitude, and
> point the axis at the north star. The motor turns that axis once every
> 24 hours. If the "telescope" is pointed at the north star, it just
> rotates in place still looking in the same direction but rolling over.
>
> Then you add a turntable to the platform. As you turn the scope on this
> platform, you increase the 'declination' of the telescope. Now when the
> motor turns, it points the telescope around in a circle around the north
> (or south) guide star. (Note that this is tricky in the southern
> hemisphere as the guide star is not as obvious as the north star, nor is
> it near the north pole. But I digress)
>
> Celestron has a basic site with some pictures of telescopes on mounts at
> http://www.celestron.com/tb-mtrms.htm
>
> The motor I would expect will need to be pulsed after it's beed
> reduced. I hope you have a *lot* of gears to go from 300-1200 rpm to 1
> revolution per day.
>
> Good Luck! I Hope this info helps!
>
> Dallas Hockley
> hockleyd@cybersurf.net
>
> > Watching the eclipse I had this wild idea of creating a permanent • projection of the sun in a wall in my room. B-)
> > Using some gears, a lens or binoculars, a sun filter and a mirror this • might be possible.
> >
> > Laurentino Martins
> >
> > [ mailto:lau@mail.telepac.pt ]
> > [ http://www.terravista.pt/Enseada/2808/ ]
> >
> > --
> > Did you check the web site first?: http://www.crynwr.com/lego-robotics
> --
> Did you check the web site first?: http://www.crynwr.com/lego-robotics
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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