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HTML 

              
                section#solar-system
  #sun
  article#mercury-trajectory
    #mercury
  article#venus-trajectory
    #venus
  article#earth-trajectory
    #earth
  article#mars-trajectory
    #mars
  //
     too far for my starship πŸͺπŸš€
            <article id="main-asteroid-belt-trajectory"></article>
            <article id="jupiter-trajectory"></article>
            <article id="saturn-trajectory"></article>
            <article id="uranus-trajectory"></article>
            <article id="neptune-trajectory"></article>
!

CSS 

              
                :root 
{
    --dark-color: rgb(0,0,0);
    --glossy-red: rgba(238, 17, 17, 1);
    --hidden-red: rgba(238, 17, 17, 0);
    --light-red: rgba(238, 17, 17, .5);
    --paths-theme: var(--very-light-red) var(--glossy-red);
    --planets-theme: var(--light-red) var(--light-red) var(--light-red) var(--glossy-red); 
    --very-light-red: rgba(238, 17, 17, .25);
}
*, *::after, *::before
{
    -webkit-box-sizing: border-box;
       -moz-box-sizing: border-box;
            box-sizing: border-box;
    padding: 0;

    margin: 0;
}
body
{
    overflow: hidden;

    background-color: var(--dark-color);
}
body #solar-system
{
    display: flex;

    width: 100vw;
    height: 100vh;

    -webkit-transform: skewX(-45deg);
       -moz-transform: skewX(-45deg);
        -ms-transform: skewX(-45deg);
         -o-transform: skewX(-45deg);
            transform: skewX(-45deg);
    -webkit-transform-origin: center;
       -moz-transform-origin: center;
        -ms-transform-origin: center;
         -o-transform-origin: center;
            transform-origin: center;

    justify-content: center;
    align-items: center;
}

/* ⚠ size of the sun is not respected here */
section #sun
{
    position: fixed;
    z-index: 100;
    /* βœ‘ real radius of the sun: 696340km */

    width: 174.085px; /* βœ‘ 40* too small compared to the real planets dimensions values */
    height: 174.085px;

    -webkit-transform: skewX(45deg);
       -moz-transform: skewX(45deg);
        -ms-transform: skewX(45deg);
         -o-transform: skewX(45deg);
            transform: skewX(45deg);

    -webkit-border-radius: 50%;
       -moz-border-radius: 50%;
            border-radius: 50%;
            background: var(--glossy-red);
            background: linear-gradient(135deg, var(--glossy-red) 20%, var(--hidden-red) 100%);

    -webkit-background: linear-gradient(135deg, var(--glossy-red) 20%, var(--hidden-red) 100%);
       -moz-background: linear-gradient(135deg, var(--glossy-red) 20%, var(--hidden-red) 100%);
         -o-background: linear-gradient(135deg, var(--glossy-red) 20%, var(--hidden-red) 100%);
        -ms-background: linear-gradient(135deg, var(--glossy-red) 20%, var(--hidden-red) 100%);
            filter: drop-shadow(0 0 2rem var(--glossy-red)) blur(1px);
    -webkit-filter: drop-shadow(0 0 2rem var(--glossy-red)) blur(1px);
       -moz-filter: drop-shadow(0 0 2rem var(--glossy-red)) blur(1px);
         -o-filter: drop-shadow(0 0 2rem var(--glossy-red)) blur(1px);
        -ms-filter: drop-shadow(0 0 2rem var(--glossy-red)) blur(1px);
}

/* planets */
article #mercury
{
    position: fixed;
    z-index: 99;
    top: 38px;

    display: flex;

    width: 24.397px; /* βœ‘ real radius of mercury: 24397km */
    height: 24.397px;
    /* βœ‘ rotation period of mercury: 58.645 days */

    -webkit-animation: planets-rotation 29.3225s linear infinite;
       -moz-animation: planets-rotation 29.3225s linear infinite;
        -ms-animation: planets-rotation 29.3225s linear infinite;
         -o-animation: planets-rotation 29.3225s linear infinite;
            animation: planets-rotation 29.3225s linear infinite;

    border-width: 2px;
    border-style: solid;
    border-color: var(--planets-theme);
    -webkit-border-radius: 50%;
       -moz-border-radius: 50%;
            border-radius: 50%;
    background: var(--hidden-red);

    justify-content: center;
    align-items: center;
}
article #venus
{
    position: fixed;
    z-index: 99;
    top: 15px;

    display: flex;

    width: 60.518px; /* βœ‘ real radius of venus: 60518km */
    height: 60.518px;
    /* βœ‘ rotation period of venus 243.023 days */

    -webkit-animation: planets-rotation 121.513s linear infinite;
       -moz-animation: planets-rotation 121.513s linear infinite;
        -ms-animation: planets-rotation 121.513s linear infinite;
         -o-animation: planets-rotation 121.513s linear infinite;
            animation: planets-rotation 121.513s linear infinite;

    border-width: 2px;
    border-style: solid;
    border-color: var(--planets-theme);
    -webkit-border-radius: 50%;
       -moz-border-radius: 50%;
            border-radius: 50%;
    background: var(--hidden-red);

    justify-content: center;
    align-items: center;
}
article #earth
{
    position: fixed;
    z-index: 99;
    top: 35px;

    display: flex;

    width: 63.71px; /* βœ‘ real radius of the earth: 6371km */
    height: 63.71px;
    /* βœ‘ animation-duration: .5s = 24hours on earth */

    -webkit-animation: planets-rotation .4874s linear infinite;
       -moz-animation: planets-rotation .4874s linear infinite;
        -ms-animation: planets-rotation .4874s linear infinite;
         -o-animation: planets-rotation .4874s linear infinite;
            animation: planets-rotation .4874s linear infinite;

    border-width: 2px;
    border-style: solid;
    border-color: var(--planets-theme);
    -webkit-border-radius: 50%;
       -moz-border-radius: 50%;
            border-radius: 50%;
    background: var(--hidden-red);

    justify-content: center;
    align-items: center;
}
article #earth::after
{
    position: inherit;

    width: 40%;
    height: 40%;

    content: '';
    -webkit-animation: earth-blinking 2s linear infinite;
       -moz-animation: earth-blinking 2s linear infinite;
        -ms-animation: earth-blinking 2s linear infinite;
         -o-animation: earth-blinking 2s linear infinite;
            animation: earth-blinking 2s linear infinite;

    -webkit-border-radius: inherit;
       -moz-border-radius: inherit;
            border-radius: inherit;
    background: var(--glossy-red);

    -webkit-filter: drop-shadow(0 0 .3rem var(--light-red)) blur(.5px);
       -moz-filter: drop-shadow(0 0 .3rem var(--light-red)) blur(.5px);
         -o-filter: drop-shadow(0 0 .3rem var(--light-red)) blur(.5px);
        -ms-filter: drop-shadow(0 0 .3rem var(--light-red)) blur(.5px);
            filter: drop-shadow(0 0 .3rem var(--light-red)) blur(.5px);
}
article #mars
{
    position: fixed;
    z-index: 99;
    top: 288px;

    display: flex;

    width: 33.895px; /* βœ‘ real radius of mars: 33895km */
    height: 33.895px;
    /* βœ‘ animation-duration: .5s = 24hours on earth */

    -webkit-animation: planets-rotation .5128s linear infinite;
       -moz-animation: planets-rotation .5128s linear infinite;
        -ms-animation: planets-rotation .5128s linear infinite;
         -o-animation: planets-rotation .5128s linear infinite;
            animation: planets-rotation .5128s linear infinite;

    border-width: 2px;
    border-style: solid;
    border-color: var(--planets-theme);
    -webkit-border-radius: 50%;
       -moz-border-radius: 50%;
            border-radius: 50%;
    background: var(--hidden-red);

    justify-content: center;
    align-items: center;
}
article #mars::after,
article #venus::after,
article #mercury::after
{
    width: 40%;
    height: 40%;

    content: '';

    -webkit-border-radius: inherit;
       -moz-border-radius: inherit;
            border-radius: inherit;
    background: var(--glossy-red);

    -webkit-filter: drop-shadow(0 0 .3rem var(--light-red)) blur(.5px);
       -moz-filter: drop-shadow(0 0 .3rem var(--light-red)) blur(.5px);
         -o-filter: drop-shadow(0 0 .3rem var(--light-red)) blur(.5px);
        -ms-filter: drop-shadow(0 0 .3rem var(--light-red)) blur(.5px);
            filter: drop-shadow(0 0 .3rem var(--light-red)) blur(.5px);
}

/* planets trajectory's
⚠ the distances between the planets and the sun are not respected here because of the diameter ot it */
section #mercury-trajectory
{
    position: fixed;
    z-index: 98;

    width: 203.085px; /* βœ‘ non-proportional */
    height: 203.085px;
    /* βœ‘ revolution of mercury: 87.969 days */

    -webkit-animation: solar-revolution 43.9845s linear infinite;
       -moz-animation: solar-revolution 43.9845s linear infinite;
        -ms-animation: solar-revolution 43.9845s linear infinite;
         -o-animation: solar-revolution 43.9845s linear infinite;
            animation: solar-revolution 43.9845s linear infinite;

    border-width: 2px;
    border-style: solid;
    border-color: var(--paths-theme);
    -webkit-border-radius: 50%;
       -moz-border-radius: 50%;
            border-radius: 50%;
}
section #venus-trajectory
{
    position: fixed;
    z-index: 98;

    width: 257.085px; /* βœ‘ non-proportional */
    height: 257.085px;
    /* βœ‘ revolution of venus: 224.667 days */

    -webkit-animation: solar-revolution 112.3335s linear infinite;
       -moz-animation: solar-revolution 112.3335s linear infinite;
        -ms-animation: solar-revolution 112.3335s linear infinite;
         -o-animation: solar-revolution 112.3335s linear infinite;
            animation: solar-revolution 112.3335s linear infinite;

    border-width: 2px;
    border-style: solid;
    border-color: var(--paths-theme);
    -webkit-border-radius: 50%;
       -moz-border-radius: 50%;
            border-radius: 50%;
}
section #earth-trajectory
{
    position: fixed;
    z-index: 98;

    width: 332.085px; /* βœ‘ non-proportional */
    height: 332.085px;
    /* βœ‘ revolution of the earth: 365.2422 days */

    -webkit-animation: solar-revolution 182.6211s linear infinite;
       -moz-animation: solar-revolution 182.6211s linear infinite;
        -ms-animation: solar-revolution 182.6211s linear infinite;
         -o-animation: solar-revolution 182.6211s linear infinite;
            animation: solar-revolution 182.6211s linear infinite;

    border-width: 2px;
    border-style: solid;
    border-color: var(--paths-theme);
    -webkit-border-radius: 50%;
       -moz-border-radius: 50%;
            border-radius: 50%;
}
section #mars-trajectory
{
    position: fixed;
    z-index: 98;

    width: 446.085px; /* βœ‘ non-proportional */
    height: 446.085px;
    /* βœ‘ revolution of mars: 686.885 days */

    -webkit-animation: solar-revolution 343.4425s linear infinite;
       -moz-animation: solar-revolution 343.4425s linear infinite;
        -ms-animation: solar-revolution 343.4425s linear infinite;
         -o-animation: solar-revolution 343.4425s linear infinite;
            animation: solar-revolution 343.4425s linear infinite;

    border-width: 2px;
    border-style: solid;
    border-color: var(--paths-theme);
    -webkit-border-radius: 50%;
       -moz-border-radius: 50%;
            border-radius: 50%;
}

/*
β–€β–„β–€β–„β–€β–„β–€β–„β–€β–„β–€β–„ ANIMATIONS β–€β–„β–€β–„β–€β–„β–€β–„β–€β–„β–€β–„
*/

@keyframes solar-revolution
{
    to
    {
        transform: rotate(360deg) ;
    }
}

@keyframes planets-rotation
{
    to
    {
        transform: rotate(360deg) ;
    }
}
@keyframes earth-blinking
{
    from
    {
        background-color: var(--glossy-red);

        filter: drop-shadow(0 0 .3rem var(--light-red)) blur(.5px);
    }
    to
    {
        background-color: var(--dark-color);

        filter: drop-shadow(0 0 0 var(--light-red)) blur(0);
    }
}

/* media queries
smartphone*/
@media only screen and (max-width: 768px)
{
    section #sun
    {
        width: 87.0425px;
        height: 87.0425px;
    }
    section #mercury-trajectory
    {
        width: 101.5425px;
        height: 101.5425px;
    }
    article #mercury
    {
        top: 17px;

        width: 12.1985px;
        height: 12.1985px;
    }
    section #venus-trajectory
    {
        width: 128.5425px;
        height: 128.5425px;
    }
    article #venus
    {
        top: 6px;

        width: 30.259px;
        height: 30.259px;
    }
    section #earth-trajectory
    {
        width: 166.0425px;
        height: 166.0425px;
    }
    article #earth
    {
        top: 16px;

        width: 31.855px;
        height: 31.855px;
    }
    section #mars-trajectory
    {
        width: 223.0425px;
        height: 223.0425px;
    }
    article #mars
    {
        top: 56px;

        width: 16.9475px;
        height: 16.9475px;
    }
}

/* 4K Ultra HD */
@media only screen and (min-width: 1921px)
{
    section #sun
    {
        width: 348.17px;
        height: 348.17px;
    }
    section #mercury-trajectory
    {
        width: 406.17px;
        height: 406.17px;
    }
    article #mercury
    {
        top: 82px;

        width: 48.794px; /* βœ‘ real diameter of mercury: 4879.4km*/
        height: 48.794px;
    }
    section #venus-trajectory
    {
        width: 514.17px;
        height: 514.17px;
    }
    article #venus
    {
        top: 28px;

        width: 121.036px; /* βœ‘ real diameter of venus: 12103.6km */
        height: 121.036px;
    }
    section #earth-trajectory
    {
        width: 664.17px;
        height: 664.17px;
    }
    article #earth
    {
        top: 68px;

        width: 127.42px; /* βœ‘ real diameter of the earth: 12742km */
        height: 127.42px;
    }
    section #mars-trajectory
    {
        width: 892.14px;
        height: 892.14px;
    }
    article #mars
    {
        top: 242px;

        width: 67.79px; /* βœ‘ real diameter of mars: 6779km */
        height: 67.79px;
    }
}
/*
8K Ultra HD ...(*￣０￣)γƒŽ
@media only screen and (min-width: 3841px) {}
*/
!

JS
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999px

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