Elliptical orbits for planets

[mwforum@xxxxxxxxxxxxxxxxxx (Walter Smith)]

This is how I had my students make ovals . Walt

 

to ellipse :s :e

pd

local "n 

make "n 0

repeat 360[rt :n fd :s lt :n lt :n fd :s * :e rt :n make "n :n + 1]

end

 

-----Original Message-----
From: mwforum-admin@xxxxxxxxxxxxxxxxxx
[mailto:mwforum-admin@xxxxxxxxxxxxxxxxxx] On Behalf Of
GrahamWilliams@xxxxxxxxxxxxxxxxxxxxxx
Sent: Tuesday, March 04, 2003 9:32 PM
To: mwforum@xxxxxxxxxxxxxxxxxx
Subject: [MWForum]Elliptical orbits for planets

 

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

Title: Elliptical orbits for planets

This is how I had my students make ovals … Walt

 

to ellipse :s :e

pd

local "n

make "n 0

repeat 360[rt :n fd :s lt :n lt :n fd :s * :e rt :n make "n :n + 1]

end

 

-----Original Message-----
From: mwforum-admin@xxxxxxxxxxxxxxxxxx [mailto:mwforum-admin@xxxxxxxxxxxxxxxxxx] On Behalf Of GrahamWilliams@xxxxxxxxxxxxxxxxxxxxxx
Sent: Tuesday, March 04, 2003 9:32 PM
To: mwforum@xxxxxxxxxxxxxxxxxx
Subject: [MWForum]Elliptical orbits for planets

 

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