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u(t) is called 60 times per second. t: Elapsed time in seconds. S: Shorthand for Math.sin. C: Shorthand for Math.cos. T: Shorthand for Math.tan. R: Function that generates rgba-strings, usage ex.: R(255, 255, 255, 0.5) c: A 1920x1080 canvas. x: A 2D context for that canvas.
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Mar 3, 2017 6:12 PM

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Mar 3, 2017 3:31 PM

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Mar 3, 2017 7:50 AM

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  • The approximate orbits of the newly discovered Trappist-1 system, three of the seven planets lie in the habitable zone. The innermost planet is not shown here.
  • u/sfz
    I love these space science ones!
  • u/SpecialAgent
    The outermost planet circles the sun around every 20 Earth days, that is a very tight year!
  • u/donbright
    outstanding!

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remix of d/1301 by u/walsh9

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Mar 3, 2017 3:41 AM

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Mar 3, 2017 2:36 AM

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  • This shows the pattern traced by a line directly between the Earth and Venus as they orbit the sun. This pattern is pretty ancient, for example discussed in the book Quadrivum about the old academic relationships between art and science. This type of pattern may be helpful to appreciate the concept of Orbital Resonance in a planetary system.

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Mar 2, 2017 10:58 PM

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Mar 2, 2017 9:32 PM

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  • Note: doesn’t work in Firefox < 53 because of missing support for MouseEvent.x/y

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Mar 2, 2017 6:29 PM

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  • Optical illusion thingy. It's supposed to look like the red lines are not really straight and parallel. #bartjs

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Mar 2, 2017 6:27 PM

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function u(t) {

Mar 2, 2017 10:55 AM

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  • Illustrates the orbits of the first 4 planets in our solar system. The distance from the sun (not shown but expected in the center) and the orbital periods are to approximate scale. Variable A holds the planetary data, positions 0-3 indicate the distance in Astronomical Units from the sun, positions 4-7 the number of days for orbital periods. These are rounded to fit into the 140 byte limit. Earth should be 3.65, but is rounded up to 4. Not perfect but a close approximation. q is the radius of each orbit (derived from the AU distance), and d is the angle of the planet on the orbital path (derived from the days per orbital period).

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