Re: Sunrise or Sunset
Posted: Mon Jul 26, 2021 9:31 am
Sunset from Cross Mountain Trail after climbing Gladstone.
It’s called a “Frame of Reference” in physics. (See image below for an example) Of course we are a geocentric society since we are all on this geoid we call Earth which is moving/rotating through the vacuum of space. Since we can’t feel the Earth’s movement, from our frame of reference we are stationary and it is the Sun that is moving/rising/setting. This Scientific American webpage (https://www.scientificamerican.com/arti ... earth-mov/) states that:Barnold41 wrote: ↑Tue Oct 19, 2021 10:02 am Dunno if it's been mentioned, but it's interesting that we still refer to sunrise and sunset as if we live in a geocentric society. We have long understood that this is not the case and yet we continue to pretend that the sun is "rising" in the east and "setting" in the west.
I mean if you really want to get pedantic about it a heliocentric model has no intrinsic merit over a geocentric one as far as physics is concerned. You can construct a perfectly valid set of physical rules for a non-inertial reference frame if you want to, your kinematics equations will just have a few extra terms. It is mathematically impossible to prove that the Earth is not the center of the universe. You can read more about that here: https://en.wikipedia.org/wiki/Principle_of_relativityBarnold41 wrote: ↑Tue Oct 19, 2021 10:02 am Dunno if it's been mentioned, but it's interesting that we still refer to sunrise and sunset as if we live in a geocentric society. We have long understood that this is not the case and yet we continue to pretend that the sun is "rising" in the east and "setting" in the west.
geojed wrote: ↑Tue Oct 19, 2021 10:23 am Umm, it’s called a “Frame of Reference” in physics. (See image below for an example) Of course we are a geocentric society since we are all on this geoid we call Earth which is moving/rotating through the vacuum of space. Since we can’t feel the Earth’s movement, from our frame of reference we are stationary and it is the Sun that is moving/rising/setting.
074425AE-E216-446B-997E-FB043A3F375C.jpeg
This Scientific American webpage (https://www.scientificamerican.com/arti ... earth-mov/) states that:
- Earth Rotates at ~1000mph (at the equator),
- Earth orbits the Sun at ~67,000mph,
- Our solar system orbits the center of our galaxy at 490,000mph,
- Our galaxy is moving towards the "Great Attractor" at 1000km/s.
- The closest we can come to a "universal frame of reference" is the CBR (Cosmic Background Radiation), which permeates all space, and we are moving 390km/s with respect to it.
timewarp01 wrote: ↑Tue Oct 19, 2021 11:57 am I mean if you really want to get pedantic about it a heliocentric model has no intrinsic merit over a geocentric one as far as physics is concerned. You can construct a perfectly valid set of physical rules for a non-inertial reference frame if you want to, your kinematics equations will just have a few extra terms. It is mathematically impossible to prove that the Earth is not the center of the universe. You can read more about that here: https://en.wikipedia.org/wiki/Principle_of_relativity