From c5bc3e94154150b8969032ecced996646a160a7d Mon Sep 17 00:00:00 2001 From: Kitiplex Engineering Date: Wed, 4 Jun 2025 22:03:35 +0800 Subject: [PATCH 1/2] initial --- website/cosmos/astrophysics/keplers-law.mdx | 57 +++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 website/cosmos/astrophysics/keplers-law.mdx diff --git a/website/cosmos/astrophysics/keplers-law.mdx b/website/cosmos/astrophysics/keplers-law.mdx new file mode 100644 index 000000000..a0d60c946 --- /dev/null +++ b/website/cosmos/astrophysics/keplers-law.mdx @@ -0,0 +1,57 @@ +--- +title: Kepler's Laws of Planetary Motion +description: Understanding Kepler's Laws of Planetary Motion +--- + +# Kepler's Laws of Planetary Motion + +Johannes Kepler was a German astronomer who discovered three important rules about how planets move around the Sun. These are called **Kepler’s Laws of Planetary Motion**. + +## The Law of Orbits + +This law says: + +> **Planets move in an oval-shaped path called an ellipse, with the Sun at one end.** + +Most people think orbits are perfect circles, but they are actually slightly stretched out. + +![Orbit Shape](https://en.wikipedia.org/wiki/Kepler%27s_laws_of_planetary_motion#/media/File:Circular_orbit_of_planet_with_(eccentricty_of_0.0).gif) + + +## The Law of Areas + +This law says: + +> **A line between a planet and the Sun sweeps out equal areas in equal times.** + +This means a planet moves faster when it's closer to the Sun and slower when it's farther away. + +Think of it like this: if you draw a triangle from the planet to the Sun over a set time, the area of that triangle will always be the same, even if the shape looks different. + +## The Law of Periods + +This law connects how long a planet takes to go around the Sun with how far away it is. + +The equation is: + +$$ +T^2 = a^3 +$$ + +Where: + +- \( T \) is the time (in years) it takes to orbit the Sun once. +- \( a \) is the average distance from the Sun (in units called astronomical units or AU). + +This means that planets farther from the Sun take much longer to go around it. + + +## Summary + +Kepler's Laws help us understand how the planets move: + +1. Planets move in ellipses. +2. Planets move faster when closer to the Sun. +3. Farther planets take longer to orbit the Sun. + +These rules helped other scientists, like Isaac Newton, figure out even more about gravity and space. From d93763dfd85290685e4f4ba7fad368d20ec32a26 Mon Sep 17 00:00:00 2001 From: KPXEng Date: Sun, 29 Jun 2025 22:52:33 +0800 Subject: [PATCH 2/2] Update keplers-law.mdx --- website/cosmos/astrophysics/keplers-law.mdx | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/website/cosmos/astrophysics/keplers-law.mdx b/website/cosmos/astrophysics/keplers-law.mdx index a0d60c946..c97acf5c0 100644 --- a/website/cosmos/astrophysics/keplers-law.mdx +++ b/website/cosmos/astrophysics/keplers-law.mdx @@ -15,7 +15,7 @@ This law says: Most people think orbits are perfect circles, but they are actually slightly stretched out. -![Orbit Shape](https://en.wikipedia.org/wiki/Kepler%27s_laws_of_planetary_motion#/media/File:Circular_orbit_of_planet_with_(eccentricty_of_0.0).gif) +![Orbit Shape](https://upload.wikimedia.org/wikipedia/commons/a/af/Circular_orbit_of_planet_with_%28eccentricty_of_0.0%29.gif) ## The Law of Areas