Dear all, today I decided to take a closer look at the observed ‘retrograde’ motion of the lunar nodes. It turned out to be a most interesting affair.

“The lunar nodes are points at which the Moon’s orbit crosses the ecliptic. (…). The line of nodes, the intersection between the two respective planes, has a retrograde motion: for an observer on Earth, it rotates westward along the ecliptic with a period of 18.6 years or 19.3549° per year. When viewed from the celestial north, the nodes move clockwise around Earth, opposite to Earth’s own spin and its revolution around the Sun.” Lunar node - Wikipedia

Caption of this diagram from the Wikipedia: “The lunar nodes are the two points where the Moon’s orbital path crosses the ecliptic, the Sun’s apparent yearly path on the celestial sphere.”
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So let’s see: the annual ‘clockwise’ motion of the lunar nodes is 19.3549°, which is 5.37636 % of 360°.

In the TYCHOS model, the annual distance covered by the Earth-Moon system (as it revolves ‘clockwise’ around the PVP orbit) is 14036km. Hence, in 18.6 years it moves by 18.6 x 14036km = 261069.6 km.

Now, we see that 5.37636 % of 261069.6 km = 14036.04 km

We may therefore conclude what follows:

The annual (‘clockwise’) rotational rate of the Moon’s nodes is commensurate with the annual (‘clockwise’) motion of the Earth-Moon system – as stipulated by the TYCHOS model.

Let me try to rephrase this. The ‘nodes’ travel around earth 180 degrees out from one another all the way around the ‘clock face’? i.e. 12 & 6, 1 & 7, 2 & 8 etc.?

I think I get it. This phenomena is what causes the eclipses to move around the globe isn’t it?

Can you create a graphic that depicts this? (you’re probably already working on it )

The fact that the lunar nodes ‘tick annually by one unit’ of their 18.6-year 360° rotation (i.e. every 14036km of the Earth-Moon system’s motion) should perhaps not come as a surprise. As I illustrated in Chapter 13 of my book, the so-called exeligmos cycle of 54.1 years is completed when the Earth-Moon system has covered the distance of the Moon’s orbital diameter:

“An exeligmos (Greek: ἐξέλιγμος — turning of the wheel) is a period of 54 years + 33 days that can be used to predict successive eclipses with similar properties and location. For a solar eclipse, after every exeligmos a solar eclipse of similar characteristics will occur in a location close to the eclipse before it. For a lunar eclipse the same part of the earth will view an eclipse that is very similar to the one that occurred one exeligmos before it.”

I read your conversation today at Hastro. I followed two of those links also. I wanted to post some from one but I will paraphrase here. They say something like this, “Let’s pretend the moon’s orbit is circular, there are no perturbations, the sun orbits the earth, etc.”

And all I can do is laugh not because they must use a non-heliocentric model for anything to work but because it doesn’t even phase them!