Tiada leraian lebih besar.
Galilean_moon_Laplace_resonance_animation.gif (365 × 245 piksel, saiz fail: 351 KB, jenis MIME: image/gif, berulang, 288 bingkai, 5.8 s)
Ringkasan
| Keterangan |
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). |
| Tarikh | (UTC) |
| Sumber | based on earlier version of this file, avail. below |
| Pengarang | User:Matma Rex |
| Kebenaran (Penggunaan semula fail ini) |
Public Domain |
| Versi lain |
|
.svg)
.svg)
Perlesenan
|
Saya selaku pemegang hak cipta karya ini melepaskan karya ini ke dalam domain awam di seluruh dunia. Di sesetengah negara, undang-undangnya mungkin tidak mengizinkan; jika begitu: Saya memberi sesiapa sahaja hak untuk menggunakan karya ini untuk apa jua tujuan, tanpa sebarang syarat, melainkan undang-undang menetapkan syarat-syarat sedemikian. |
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'
Sejarah fail
Klik pada tarikh/waktu untuk melihat rupa fail tersebut pada waktu itu.
| Tarikh/Waktu | Gambar kenit | Ukuran | Pengguna | Komen | |
|---|---|---|---|---|---|
| semasa | 18:08, 16 Februari 2011 | | 365 × 245 (351 KB) | Matma Rex | a much nicer version, even if somewhat larger |
| 18:33, 23 Disember 2010 |  | 365 × 245 (21 KB) | 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 KB) | 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 }} |
Penggunaan fail
2 buah laman berikut menggunakan fail ini:
Penggunaan fail sejagat
Fail ini digunakan oleh wiki-wiki lain yang berikut:
- Penggunaan di af.wikipedia.org
- Penggunaan di ar.teknopedia.teknokrat.ac.id
- Penggunaan di ast.wikipedia.org
- Penggunaan di azb.wikipedia.org
- Penggunaan di az.wikipedia.org
- Penggunaan di ba.wikipedia.org
- Penggunaan di be.wikipedia.org
- Penggunaan di ca.wikipedia.org
- Penggunaan di ckb.wikipedia.org
- Penggunaan di cs.wikipedia.org
- Penggunaan di da.wikipedia.org
- Penggunaan di de.teknopedia.teknokrat.ac.id
- Penggunaan di en.wikipedia.org
- Penggunaan di en.wikiversity.org
- Penggunaan di eo.wikipedia.org
- Penggunaan di es.teknopedia.teknokrat.ac.id
- Penggunaan di fi.wikipedia.org
- Penggunaan di fr.teknopedia.teknokrat.ac.id
Lihat banyak lagi penggunaan sejagat bagi fail ini.
