State at least one plausible argument against the notion that Earth moves around the sun.

Name: Problem 13, Chapter 1: Physics: Concepts and Connections
Uploaded: 2021-07-01T14:24:28-08:00
Duration: 4 min 29 s
Channel: Linda Winkler
Description: State at least one plausible argument against the notion that Earth moves around the sun.

State at least one plausible argument against the notion...

Key Concepts

Heliocentrism

This concept refers to the astronomical model in which the Sun is at the center of the solar system and the Earth, along with other planets, revolves around it. It challenges the intuitive notion of a stationary Earth by explaining the observed motions of celestial bodies, such as retrograde motion, through the relative movement of planets in orbit.

Geocentrism

This is the historical model that places Earth at the center of the universe, with the Sun, stars, and planets revolving around it. It was largely based on everyday observations where the Earth does not appear to move, and it provided a framework that matched the sensory experiences of early astronomers before more precise instruments were available.

Stellar Parallax

Stellar parallax is the apparent shift in the position of a nearby star relative to distant background stars as observed from different positions in Earth's orbit. Early astronomers argued against the Earth's motion because they could not detect any such shift with the instruments of the time, which was used as a key point by proponents of a stationary Earth.

Inertial Frames of Reference

This concept involves understanding that observations of motion depend on the observer's frame of reference. In an inertial frame, constant motion may not be directly felt or observed, which can lead to arguments against the detection of Earth's movement. This idea helps explain why, without sufficient observational tools, one might not perceive the Earth’s motion even if it exists.

Transcript

00:01 One of the big arguments against the heliocentric model of the solar system that occurred for many thousands of years is if the earth were moving through space, there would be consequences.

00:16 And since those consequences have not been detected, how can the earth possibly be moving through space? so one of the things that people thought would be wouldn't objects fall off the earth? wouldn't objects get flung from the earth? and of course this was misunderstanding how the gravitational force holds us onto the earth.

00:53 And also without quantitative understanding of how earth is moving, how fast earth is moving, and how strong gravity is.

01:04 You couldn't really determine whether objects would fly off or not.

01:09 And wouldn't clouds in the atmosphere be left behind? again, that's a misunderstanding of how gravity works and how particles in our atmosphere do escape because of gravity and temperature.

01:34 So there were no plausible explanations for that.

01:37 The biggest explanation, though, was a fairly good scientific reasoning for why the earth couldn't be moving through space.

01:48 And it was the idea that wouldn't we see the sky shifting against the backdrop of stars as the earth moves.

02:15 And i won't get into the technical details, but this is a well -known phenomena.

02:22 So, you know, the idea is sometimes called parallax.

02:27 And in particular, when they say the sky shifting, wouldn't we see stars doing this as the earth moved around? but let's say you're in your automobile.

02:37 So this is sort of the idea.

02:39 Let's say you're driving in your automobile and looking at your speedometer.

02:46 So there's the needle with the readings, et cetera...

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