Spherical Geometry: Great Circle or Geodesic vs. Small Circle

Great Circle / Geodesic:

Any circle that passes through the center of a sphere is called a Great Circle or Geodesic.

Small Circle:

Any plane intersecting the sphere but not passing through the sphere is called Small Circle.

Maya, Aztecs & Native Americans

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The Maya, the Aztecs, and the Native Americans are ancient civilizations that made significant contributions to the study of the stars and the universe. Here is a brief overview of each of these cultures and their contributions to astronomy: The Maya: The Maya were a civilization that lived in what is now Mexico and Central … Maya, Aztecs & Native…

The Celestial Sphere

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The celestial sphere is an imaginary sphere with the Earth at its center. It is used to represent the positions of celestial objects, such as stars, planets, and galaxies, as they appear in the sky. The celestial sphere is divided into a number of sections, such as- The celestial equator: The celestial equator is an … The Celestial Sphere Read…

What is Retrograde motion?

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——————————————————————————————————————————————————————————————————————– Exam Question Answer: Question: What is Retrograde Motion? Answer: Retrograde motion is a phenomenon that occurs when a celestial object appears to move backward in the sky. This is most commonly observed with the planets in the solar system, but it can also be observed with other celestial objects, such as asteroids and comets. … What is Retrograde motion?…

The Ptolemaic Model of Planetary Motion

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The Ptolemaic model of planetary motion is a geocentric model of the solar system that was proposed by Claudius Ptolemy, a Greek astronomer, in the 2nd century AD. In this model, the Earth is stationary at the center of the universe and the celestial objects, such as the sun, moon, and planets, revolve around it … The Ptolemaic Model of…

What is an Epicycle in Astronomy??

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An epicycle is a geometric concept used in ancient and medieval astronomy to explain the retrograde motion of celestial objects, such as planets. It is a small circle that moves on the circumference of a larger circle, called a deferent, with its own center. The planet is placed at the center of the epicycle and … What is an Epicycle…

What is Equants?

Leave a Comment / Astrophysics, The Celestial Sphere

An equant is a geometric concept used in ancient and medieval astronomy to improve the accuracy of the epicycle and deferent system, which was used to explain the retrograde motion of celestial objects, such as planets. An equant is a point located at a fixed distance from the center of the deferent circle and is … What is Equants? Read…

Great Circle / Geodesic:

Small Circle:

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