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Lunar Perigee and Apogee Calculator To display the date, time, and distance of lunar perigees and apogees for a given year, enter the year in the box below and press “Calculate”. Depending on the speed of your computer, it may take a while for the results to appear in the text boxes. Earth's Perihelion and Aphelion. The Earth is closest to the Sun, or at the perihelion, about 2 weeks after the December Solstice, when it is winter in the Northern Hemisphere.Conversely, the Earth is farthest away from the Sun, at the aphelion point, 2 weeks after the June Solstice, when the Northern Hemisphere is enjoying warm summer months. An apsis, plural apsidesis a point of greatest or least distance of a body in an elliptic orbit about a larger body. For a body orbiting the Sun the greatest and least distance points are called respectively aphelion and perihelion, whereas for any satellite of Earth including the Moon the corresponding points are apogee and perigee. In orbital mechanics, the apsis technically refers to the. For the special case of circular orbits, the semimajor axis is equal to the radius. You can check this calculation by setting the masses to 1 Sun and 1 Earth, and the distance to 1 astronomical unit AU, which is the distance between the Earth and the Sun. You will see an orbital period close to the familiar 1.

To calculate the perihelion and aphelion distances, you use the following: d aphelion = 1e a d perihelion = 1 " e a Just like you would measure the distance between cities in kilometers rather than centimeters, there is a typical unit for measuring planetary orbits: the Astronomical Units AU. Astronomers define 1 AU as the average distance between the Earth and the Sun and equals 93. 27/11/2011 · Calculate the orbital period of a comet with a perihelion distance of 0.6 AU and aphelion in the Oort cloud, at a distance of 9.5×10^4 AU from the Sun. A short-period comet has a perihelion distance of 1 AU and an orbital period of 216 years. What is its maximum distance. 16/01/2009 · This equation follows directly from conservation of energy. The total energy kinetic plus potential of a point mass m separated by a distance r from some other point mass M and moving with a velocity v relative to that other point is $$E = \frac 1 2 m v^2 - \frac G M mr$$. Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share. Calculate the orbital period of a comet with a perihelion distance of 0.5 AU and aphelion in the Oort cloud, at a distance of 50,000 AU from the Sun? self.askastronomy submitted 2 years ago by [deleted].