Lêer:Galilean_moon_Laplace_resonance_animation.gif
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Galilean_moon_Laplace_resonance_animation.gif (365 × 245 piksels, lêergrootte: 351 KG, MIME-tipe: image/gif, herhalend, 288 rame, 5,8 s)
Hierdie lêer kom vanaf Wikimedia Commons en kan ook in ander projekte gebruik word. Die beskrywing op die lêer se inligtingsblad word hieronder weergegee.
Opsomming
BeskrywingGalilean moon Laplace resonance animation.gif |
English: Animation of the 1:2:4 Laplace resonance between Io, Europa, and Ganymede. The labels indicate the ratios of orbital periods: Europa's is twice Io's, and Ganymede's is four times Io's. Warning: do not downsize the image below its original size of 365 × 245 when used in a Wikipedia article, as the animation won't move then (at least not for all users). |
Datum | (UTC) |
Bron | based on earlier version of this file, avail. below |
Outeur | User:Matma Rex |
Toestemming (Hergebruik van die lêer) |
Public Domain |
Ander weergawes |
|
Lisensiëring
Public domainPublic domainfalsefalse |
Ek, die outeursreghouer van hierdie werk, stel dit hiermee in die publieke domein vry. Dit geld wêreldwyd. In sommige lande is dit dalk nie wettiglik moontlik nie. Indien so: Ek verleen aan enigiemand die reg om hierdie werk te gebruik vir enige doel, sonder voorwaardes, tensy sulke voorwaardes deur die wet vereis word. |
Generation
This image has been generated by the following Ruby code and optimized in GIMP.
# author: Matma Rex
# code licensed under CC-BY-SA license
require 'rubygems'
require 'RMagick'
include Magick
step=5 # degrees by which Io will move in every frame
# Io, Europa, Ganymede
distances=[46, 72, 112]
speeds=[1, 0.5, 0.25]
shifts=[-90, 90, -90]
centerx=122
centery=122
list=ImageList.new
base=Image.new 365,245
base.ticks_per_second=1000
base.delay=5*step
gc=Draw.new
# lines
gc.stroke 'lightgrey'
gc.stroke_width 1.5
distances.each{|d| gc.line centerx, centery-d, 360, centery-d}
gc.line centerx, centery, 360, centery
# orbits
gc.stroke 'grey'
gc.fill 'none'
gc.stroke_width 2
distances.each{|d| gc.circle centerx, centery, centerx, centery+d}
# Jupiter
gc.stroke 'black'
gc.fill 'black'
gc.stroke_width 2
gc.circle centerx, centery, centerx, centery+9
# labels
# gc.stroke_width 0
# gc.gravity EastGravity
# gc.font_family 'arial'
# gc.font_size 18
# gc.font_weight LighterWeight
# gc.text_align RightAlign
# gc.text_undercolor 'white'
# gc.text 360, centery-distances[0]+7, '" Io 1:1"'.upcase
# gc.text 360, centery-distances[1]+7, '" Europa 2:1"'.upcase
# gc.text 360, centery-distances[2]+7, '" Ganymede 4:1"'.upcase
# gc.font_weight BoldWeight
# gc.text 360, centery+7, '" Jupiter"'.upcase
gc.draw base
# ImageMagick sucks at text - load a predefined text img instead
base=base.composite Image.read('text.png')[0].transparent('cyan'), 0, 0, OverCompositeOp
(0..(4*360-1)).step(step) do |deg|
img=base.clone
gc=Draw.new
0.upto(2) do |i|
rad=(deg*speeds[i] + shifts[i]) * Math::PI / 180.0
x=distances[i] * -Math.cos(rad)
y=distances[i] * Math.sin(rad)
gc.circle centerx+x, centery+y, centerx+x, centery+y+4.5
end
gc.draw img
list << img
end
list.write 'magick.gif'
Items portrayed in this file
uitbeelding
16 Februarie 2011
Lêergeskiedenis
Klik op die datum/tyd om te sien hoe die lêer destyds gelyk het.
Datum/Tyd | Duimnael | Dimensies | Gebruiker | Opmerking | |
---|---|---|---|---|---|
huidig | 18:08, 16 Februarie 2011 | 365 × 245 (351 KG) | Matma Rex | a much nicer version, even if somewhat larger | |
18:33, 23 Desember 2010 | 365 × 245 (21 KG) | Bark~commonswiki | Changed direction from clockwise to counter-clockwise to better represent the Jovian system with the view from above the north pole, the typical convention. The previous version accidentally implied retrograde motion in the system, which is not the case. | ||
08:17, 3 November 2006 | 365 × 245 (32 KG) | Splarka | {{Information |Description=Animation of the 4:2:1 Laplace resonance between Ganymede, Europa, and Io |Source=created for Wikimedia |Date=~~~~~ |Author=User:Splarka |Permission=Public Domain |other_versions=This is the first }} |
Lêergebruik
Die volgende 3 bladsye gebruik dié lêer:
Globale lêergebruik
Die volgende ander wiki's gebruik hierdie lêer:
- Gebruik in ar.wikipedia.org
- Gebruik in ast.wikipedia.org
- Gebruik in azb.wikipedia.org
- Gebruik in az.wikipedia.org
- Gebruik in ba.wikipedia.org
- Gebruik in be.wikipedia.org
- Gebruik in ca.wikipedia.org
- Gebruik in ckb.wikipedia.org
- Gebruik in cs.wikipedia.org
- Gebruik in da.wikipedia.org
- Gebruik in de.wikipedia.org
- Gebruik in en.wikipedia.org
- Gebruik in en.wikiversity.org
- Gebruik in eo.wikipedia.org
- Gebruik in es.wikipedia.org
- Gebruik in fi.wikipedia.org
- Gebruik in fr.wikipedia.org
- Gebruik in gl.wikipedia.org
- Gebruik in he.wikipedia.org
Wys meer globale gebruik van die lêer.