Hukum Gerakan Planet Kepler
caption: Figure 1: Illustration of Kepler's three laws with two planetary orbits. (1) The orbits are ellipses, with focal points ƒ 1 and ƒ 2 for the first planet and ƒ 1 and &>. (2) The two shaded sectors A 1 and A 2 have the same surface area and the time for planet 1 to cover segment A 1 is equal to the time to cover segment A 2. (3) The total orbit times for planet 1 and planet 2 have a ratio a 13/2 : a 23/2.
caption: Animasi dari gerak Kepler
caption: Figure 2: Hukum Kepler pertama menempatkan Matahari di satu titik fokus edaran elips.
caption: Figure 3: Illustrasi hukum Kepler kedua. Bahwa Planet bergerak lebih cepat di dekat Matahari dan lambat di jarak yang jauh. Sehingga, jumlah area adalah sama pada jangka waktu tertentu.