Geriatric Geocentric Geometry

Geriatric Geocentric Geometry

Egotistical astronomers have a predilection for thinking they are the Centre of the Universe.

Perhaps this explains why astronomers are comfortable with Geocentric Cosmology.

In astronomy, the Geocentric Model (also known as geocentrism, or the Ptolemaic system) is a description of the cosmos where Earth is at the orbital center of all celestial bodies.

This model served as the predominant cosmological system in many ancient civilizations such as ancient Greece including the noteworthy systems of Aristotle (see Aristotelian physics) and Ptolemy.

As such, they assumed that the Sun, Moon, stars, and naked eye planets circled Earth.

Two commonly made observations supported the idea that Earth was the center of the Universe.

The first observation was that the stars, the sun, and planets appear to revolve around Earth each day, making Earth the center of that system.

Further, every star was on a “stellar” or “celestial” sphere, of which the earth was the center, that rotated each day, using a line through the north and south pole as an axis.

The stars closest to the equator appeared to rise and fall the greatest distance, but each star circled back to its rising point each day.

The second common notion supporting the geocentric model was that the Earth does not seem to move from the perspective of an Earth bound observer, and that it is solid, stable, and unmoving. In other words, it is completely at rest.

Perhaps this explains why astronomers resisted Heliocentric Cosmology for so long.

Philolaus (c. 480-385 BCE) described an astronomical system in which a Central Fire (different from the Sun) occupied the centre of the universe, and a counter-Earth, the Earth, Moon, the Sun itself, planets, and stars all revolved around it, in that order outward from the centre.

Heraclides Ponticus (387–312 BCE) proposed that the Earth rotates on its axis.

Aristarchus of Samos (310 BCE – c. 230 BCE) was the first to advance a theory that the earth orbited the sun.

Further mathematical details of Aristarchus’ heliocentric system were worked out around 150 BC by the Hellenistic astronomer Seleucus of Seleucia.

Perhaps this explains why Geriatric Astronomers promote the Geocentric Ecliptic.

The ecliptic is the apparent path of the Sun on the celestial sphere, and is the basis for the ecliptic coordinate system. It also refers to the plane of this path, which is coplanar with both the orbit of the Earth around the Sun and the apparent orbit of the Sun around the Earth.

Geocentric Ecliptic

Ecliptic Geometry

Perhaps Geriatric Astronomers promote their flawed Geocentric Ecliptic because it “wobbles” and [also] needs a Zimmer frame.

The motions as described above are simplifications.

Due to the movement of the Earth around the Earth-Moon center of mass, the apparent path of the Sun wobbles slightly, with a period of about one month.

Due to further perturbations by the other planets of the Solar System, the Earth-Moon barycenter wobbles slightly around a mean position in a complex fashion.

However, there really is no excusing these Geriatric Astronomers for promoting their Geocentric Inclinations when they are describing the Heliocentric Solar System.


Orbital inclination is the angle between a reference plane and the orbital plane or axis of direction of an object in orbit around another object.

In the Solar System, the inclination of the orbit of a planet is defined as the angle between the plane of the orbit of the planet and the ecliptic.

Geocentric Inclinations are especially misleading when the inclinations of moons and artificial satellites are reported “relative to the equatorial plane of the body they orbit”.

The inclination of orbits of natural or artificial satellites is measured relative to the equatorial plane of the body they orbit if they do so close enough.

The equatorial plane is the plane perpendicular to the axis of rotation of the central body.

an inclination of 0° means the orbiting body orbits the planet in its equatorial plane, in the same direction as the planet rotates;

an inclination greater than 0° and less than 90° is a prograde orbit.

an inclination greater than 90° and less than 180° is a retrograde orbit.

an inclination of exactly 90° is a polar orbit, in which the spacecraft passes over the north and south poles of the planet; and

an inclination of exactly 180° is a retrograde equatorial orbit.

The “if they do so close enough” caveat is a very flimsy excuse for using Geocentric Inclinations when describing celestial bodies that primarily orbit the Sun.

Geocentric Inclinations instil a distorted view of the Heliocentric Solar System because the planets do not orbit the Earth.

Inclination to the Ecliptic

Inclination to the Ecliptic - bar chart

Perhaps these Geriatric Astronomers like their Geocentric Inclinations because it makes their strange inclinations look perfectly normal i.e. zero eccentricity.

Who can tell with Geocentric Astronomers!

Gallery | This entry was posted in Astrophysics, Earth, History, Solar System. Bookmark the permalink.

1 Response to Geriatric Geocentric Geometry

  1. Noa says:

    Should we consider the zodiac constellation of the solar ecliptic as a vortex? If it is so, why we see this as an ecliptic rather than a spiral? Perhaps because of our viewpoint?

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