I know you have reasons why you think the calculated distances should be smaller, but your comments in the book implied you thought large distances were somehow absurd as a concept. That’s what I was asking about. Why the very notion of trillions of km is laughable. Personally I think they seem perfectly reasonable on the face of it if one just assumes other star systems are similar in size.
Deneb being 3870 x more distant than the sun is neither more or less reasonable without context. I have no issue with 165 million x more distant as there are perfectly convincing arguments for how a star such as Deneb could be bright enough to still be visible at such a distance. Afterall the sun would still be visible at a distance of several light years. With enough mass and surface area a star can radiate enough energy to be tens of thousands of times as bright as the sun. I do have reservations about your calculated distance for Sirius as this would place it between the distances of Saturn and Uranus. Sirius can be resolved to a significantly smaller angular size than Uranus and so must be significantly smaller in actual size if it is closer to us. Which would be incredibly small for an object to trigger nuclear fusion via gravitational pressure.
I read chapter 25. I was left with questions. Such as have you looked at the distribution of positive and negative parallax stars to see if they cluster on either side of the earth? And what limit of detection did you assume when determining the % of zero parallax stars in front and behind the earth in the Tychos model?
I said our solar system. There are 8 planets in our solar system and only 1 is inhabited.