[Squeakland] sun-earth-moon
Fernando
nandofv at yahoo.es
Fri Feb 17 05:53:38 PST 2006
Another approach:
I'm using this simulation in Primary School, third level (eight years old). Children try to simulate [1] Eatrh's spin on his axis and [2] Eatrh's rotate around the Sun. Well, this is very interesting because a lot of them still think the sun rotate around the Earth!!
With basic eToy, the construct and investigate these two processes. First they paint a circular solid Base and then embed the Earth in this Base (Randy's solution is amazing but they don't know degrees).
[1] Go and Rotate for Base scketch
[2] Only Rotate for the Earth
Fernando.
Nicholas Bennett <nicholasjbennett at hotmail.com> escribió: randy,
I had done a sun earth moon system once and found that one could set the
rotation center fairly easily (I think one of the halo menu choices maybe,
also there I think you can tell it to display the rotation center and the
forward vector which can help visualize things).
I had used the embedding as described below, but found that if I simply
embedded earth in sun the earth would be 'unselectable' when it did not
overlap with the sun - which made it awkward if you wanted to go back and
add the moon later. I ended up painting the 'orbit center' of my 'orbiters'
as a small dot in the orbiters sketch - a bit strange maybe but it made it
very clear where the rotation center should be and ensured that the orbiters
stayed selectable when embedded.
regards,
nicholas
>From: Bert Freudenberg
>To: Mailinglist Squeakland
>Subject: Re: [Squeakland] sun-earth-moon
>Date: Thu, 16 Feb 2006 19:08:22 +0100
>
>Am 16.02.2006 um 16:43 schrieb Randy Heiland:
>
> > Is it possible to squeak planetary motion?
>
>Yes. You have to embed the moon into the earth (you find "embed" in
>the halo menu). Then, when you move the earth, the moon already moves
>with it.
>
>Here's an example:
>
> http://squeakland.org/project.jsp?http://impara.de/~bert/projects/
>Sonne-Erde-Mond.001.pr
>
>- Bert -
>
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