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Re: Sunrise or Sunset

Posted: Mon Jul 26, 2021 9:31 am
by Kiefer
Sunset from Cross Mountain Trail after climbing Gladstone.
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Re: Sunrise or Sunset

Posted: Thu Oct 07, 2021 1:25 pm
by supranihilest
La Sal Mountains from 9er Snipe Mountain on Sunday evening.
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Re: Sunrise or Sunset

Posted: Thu Oct 07, 2021 2:29 pm
by osprey
Solar flare near the winter solstice sunrise over Mesa Verde.
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Re: Sunrise or Sunset

Posted: Thu Oct 07, 2021 2:30 pm
by Monster5
From Mount Index, WA
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Lone Peak Cirque, UT
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Not mountainy, but on my way down from a hill. Komiza
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Re: Sunrise or Sunset

Posted: Sat Oct 16, 2021 6:56 pm
by WolverPete
Last week took a hike up to a lookout point to catch the sunrise. Sunrise over Colorado Springs on the hike up. And then Pikes Peak.
https://www.instagram.com/peterkulvetephotography/

Re: Sunrise or Sunset

Posted: Tue Oct 19, 2021 9:41 am
by Monster5
Washerwoman
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Candlestick
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Re: Sunrise or Sunset

Posted: Tue Oct 19, 2021 10:02 am
by Barnold41
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.

Re: Sunrise or Sunset

Posted: Tue Oct 19, 2021 10:23 am
by geojed
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.
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
074425AE-E216-446B-997E-FB043A3F375C.jpeg (113.54 KiB) Viewed 4689 times
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.

Re: Sunrise or Sunset

Posted: Tue Oct 19, 2021 11:57 am
by timewarp01
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_relativity

Re: Sunrise or Sunset

Posted: Tue Oct 19, 2021 12:31 pm
by Barnold41
geojed wrote: Tue Oct 19, 2021 10:23 am :lol: 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

I don't have much experience in physics, so thanks for sharing this information.

Re: Sunrise or Sunset

Posted: Tue Oct 19, 2021 4:56 pm
by Skimo95
Both have their benefits! Keep the pics coming

Re: Sunrise or Sunset

Posted: Thu Oct 21, 2021 4:13 pm
by Mark Curtis