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- https://phys.libretexts.org/Bookshelves/University_Physics/Physics_(Boundless)/5%3A_Uniform_Circular_Motion_and_Gravitation/5.6%3A_Keplers_LawsKepler’s first law is: The orbit of every planet is an ellipse with the Sun at one of the two foci.
- https://phys.libretexts.org/Courses/Prince_Georges_Community_College/PHY_1030%3A_General_Physics_I/05%3A_Uniform_Circular_Motion_and_Gravitation/5.6%3A_Keplers_LawsKepler’s first law is: The orbit of every planet is an ellipse with the Sun at one of the two foci.
- https://phys.libretexts.org/Courses/Joliet_Junior_College/Physics_201_-_Fall_2019v2/Book%3A_Custom_Physics_textbook_for_JJC/07%3A_Applications_of_Newton/7.16%3A_Keplers_LawsKepler’s first law is: The orbit of every planet is an ellipse with the Sun at one of the two foci.
- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Celestial_Mechanics_(Tatum)/08%3A_Planetary_Motions/8.03%3A_Sidereal_and_Synodic_PeriodsThe planet is moving around the Sun at a faster angular speed ω and shorter period Psid=2π/ω, which is called the sidereal period of the planet (i.e. Of all the major planets, Mars...The planet is moving around the Sun at a faster angular speed ω and shorter period Psid=2π/ω, which is called the sidereal period of the planet (i.e. Of all the major planets, Mars has the longest synodic period, namely 780 days, so that it comes to opposition and is easy to observe at intervals of a little more than two years.
- https://phys.libretexts.org/Courses/Joliet_Junior_College/Physics_201_-_Fall_2019/Book%3A_Physics_(Boundless)/6%3A_Applications_of_Newton/6.16%3A_Keplers_LawsKepler’s first law is: The orbit of every planet is an ellipse with the Sun at one of the two foci.
- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Celestial_Mechanics_(Tatum)/06%3A_The_Celestial_Sphere/6.09%3A_The_Length_of_the_YearThe calendar that we use in everyday life is the Gregorian Calendar, in which there are 365 days in most years, but 366 days in years that are divisible by 4 unless they are also divisible by 100 othe...The calendar that we use in everyday life is the Gregorian Calendar, in which there are 365 days in most years, but 366 days in years that are divisible by 4 unless they are also divisible by 100 other than those that are also divisible by 400. The Anomalistic Year is the interval between consecutive passages of the Earth through perihelion and is a little longer than the sidereal year.
