[MWForum]Elliptical orbits for planets
Walter Smith
mwforum@lists.mathcats.com
Tue, 4 Mar 2003 21:54:48 -0800
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This is how I had my students make ovals . Walt
=20
to ellipse :s :e
pd
local "n=20
make "n 0
repeat 360[rt :n fd :s lt :n lt :n fd :s * :e rt :n make "n :n + 1]
end
=20
-----Original Message-----
From: mwforum-admin@lists.mathcats.com
[mailto:mwforum-admin@lists.mathcats.com] On Behalf Of
GrahamWilliams@caulfieldgs.vic.edu.au
Sent: Tuesday, March 04, 2003 9:32 PM
To: mwforum@lists.mathcats.com
Subject: [MWForum]Elliptical orbits for planets
=20
Some of my Year 6 students are trying to create a solar-system project =
.They
have commented that similar projects on the web have the planets moving =
in
circular orbits but my students want to be as astronomically-correct as
possible and use more elliptical orbits . The problem is that I don't =
know a
'formula' to get turtle to move in an elliptical-type path. I'd very =
much
appreciate any assistance from cyberspace. Thanks Graham Williams
Victoria Australia
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<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
color=3Dblack
face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier New";
color:black'><!-- Converted from text/rtf format -->This is how I had my
students make ovals … Walt</span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
color=3Dblack
face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier New";
color:black'> </span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
color=3Dblack
face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier New";
color:black'>to ellipse :s :e</span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
color=3Dblack
face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier New";
color:black'>pd</span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
color=3Dblack
face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier New";
color:black'>local "n </span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
color=3Dblack
face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier New";
color:black'>make "n 0</span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
color=3Dblack
face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier New";
color:black'>repeat 360[rt :n fd :s lt :n lt :n fd :s * :e rt :n make =
"n
:n + 1]</span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dblack face=3D"Courier =
New"><span
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:black'>end</span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'>-----Original =
Message-----<br>
<b><span style=3D'font-weight:bold'>From:</span></b> =
mwforum-admin@lists.mathcats.com
[mailto:mwforum-admin@lists.mathcats.com] <b><span =
style=3D'font-weight:bold'>On
Behalf Of </span></b>GrahamWilliams@caulfieldgs.vic.edu.au<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> </span></font><font =
size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'>Tuesday, March
04, 2003</span></font><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma'> </span></font><font size=3D2 face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'>9:32 =
PM</span></font><font size=3D2
face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma'><br>
<b><span style=3D'font-weight:bold'>To:</span></b> =
mwforum@lists.mathcats.com<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> =
[MWForum]Elliptical
orbits for planets</span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font></p>
<p style=3D'margin-left:.5in'><font size=3D2 face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial'>Some of my Year 6 students are trying to =
create a
solar-system project .They have commented that similar projects on the =
web have
the planets moving in circular orbits but my students want to be as
astronomically-correct as possible and use more elliptical orbits . The =
problem
is that I don't know a 'formula' to get turtle to move in an =
elliptical-type
path. I'd very much appreciate any assistance from cyberspace.
Thanks Graham Williams Victoria =
Australia</span></font></p>
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