Distances: Crash Course Astronomy #25
video description
Date: 2022-04-04
Related videos
Comments and reviews: 10
Alexander
Okay you explained that parallax uses change in viewing angle to determine distance. Whenever I see videos online they always gloss over it giving the bare minimum amount of details. I know that it has something to do with trigonometry, but that is all I know. It also doesn't help (for me at least) when diagrams are either left out, or are so small that you practically need a microscope to see them.
Other than that I liked this video. If you are looking a general top down view of the topic it is great for that.
Could someone point me to a source that delves more specifically into the concept of parallax?
reply
Okay you explained that parallax uses change in viewing angle to determine distance. Whenever I see videos online they always gloss over it giving the bare minimum amount of details. I know that it has something to do with trigonometry, but that is all I know. It also doesn't help (for me at least) when diagrams are either left out, or are so small that you practically need a microscope to see them.
Other than that I liked this video. If you are looking a general top down view of the topic it is great for that.
Could someone point me to a source that delves more specifically into the concept of parallax?
reply
Blade
First part of the video with your thumb in front of you and you are closing the left and right eye while staring at it(your thumb) I thought you were trying to determine your -dominant- eye. Whichever eye is looking at your thumb and it doesn't move this is your -dominant- eye. Good information for pool players and other situations where you need to see a situation very accurately.
Around 7: 50 ish you are on a roll and free flowing with your thinking at which point. wait for it. you say, -light is pretty fast but. - I had to chuckle when I heard that.
reply
First part of the video with your thumb in front of you and you are closing the left and right eye while staring at it(your thumb) I thought you were trying to determine your -dominant- eye. Whichever eye is looking at your thumb and it doesn't move this is your -dominant- eye. Good information for pool players and other situations where you need to see a situation very accurately.
Around 7: 50 ish you are on a roll and free flowing with your thinking at which point. wait for it. you say, -light is pretty fast but. - I had to chuckle when I heard that.
reply
crash_course
In algebra class, when kids couldn't understand percentages, I was asking things like -Is the fourth root of x squared the same as the square root of x? - When the teacher said yes, that's when I began to -get it. - You can say things different ways to say the same thing. Phil is still better than most teachers, though. I never realized that the AU is such an important number. No one ever encouraged me to be an astronomer, or anything, really. Two important things that schools ought to teach, and don't, are entrepreneurship and finances.
reply
In algebra class, when kids couldn't understand percentages, I was asking things like -Is the fourth root of x squared the same as the square root of x? - When the teacher said yes, that's when I began to -get it. - You can say things different ways to say the same thing. Phil is still better than most teachers, though. I never realized that the AU is such an important number. No one ever encouraged me to be an astronomer, or anything, really. Two important things that schools ought to teach, and don't, are entrepreneurship and finances.
reply
Lindy
Just went and found a comment I'd put on another video so I could present it here.
So, a parsec is a unit of distance.
Han took a shortcut.
He covered less distance to get from start to finish. I know an actual parsec is 3. 26 lightyears, and it doesn't look like they went just over 39 lightyears (12 parsecs, but it's better than changing the definition from a unit of distance to a unit of time, right? So it's not as bad a mistake as you might think.
reply
Just went and found a comment I'd put on another video so I could present it here.
So, a parsec is a unit of distance.
Han took a shortcut.
He covered less distance to get from start to finish. I know an actual parsec is 3. 26 lightyears, and it doesn't look like they went just over 39 lightyears (12 parsecs, but it's better than changing the definition from a unit of distance to a unit of time, right? So it's not as bad a mistake as you might think.
reply
evoman1776
In my world the AU is 93 million miles. Most Americans don't know the metric units and have to recalculate in their head when you say kilometers if they really want to understand the distance. It becomes increasingly irritating having to do it several times. You should cater to your audience or at least say both.
reply
In my world the AU is 93 million miles. Most Americans don't know the metric units and have to recalculate in their head when you say kilometers if they really want to understand the distance. It becomes increasingly irritating having to do it several times. You should cater to your audience or at least say both.
reply
Norman
All distances are theoretical, because they depend on a man made or devised standard to denote a specific distance. Thus in that regard a distance is nothing more than a comparative distance between any two or more masses in the space between them.
reply
All distances are theoretical, because they depend on a man made or devised standard to denote a specific distance. Thus in that regard a distance is nothing more than a comparative distance between any two or more masses in the space between them.
reply
Shaul
I knew about the Au, the light year and par sec, when it is made in a fun way it is easier to understand and that was how I taught my son his math. Basic yet fun so 3 years later he aced it. So yeah it's good too know thanks.
reply
I knew about the Au, the light year and par sec, when it is made in a fun way it is easier to understand and that was how I taught my son his math. Basic yet fun so 3 years later he aced it. So yeah it's good too know thanks.
reply
Dalton
It seems parralax calculations use static bodies. When both the observed body, and the 'distant background' are both moving. Is this just considered an inconsequential difference?
reply
It seems parralax calculations use static bodies. When both the observed body, and the 'distant background' are both moving. Is this just considered an inconsequential difference?
reply
Gary
I think the universe stretches into infinity, when i look up at the black sky i'm looking at nothing, just the distance of infinity. It never ends forever. -
reply
I think the universe stretches into infinity, when i look up at the black sky i'm looking at nothing, just the distance of infinity. It never ends forever. -
reply
taqiia
I love how Crash Course teaches for a few minutes like I can understand straight away. My teacher teaches for a week and I can't understand the basics
reply
I love how Crash Course teaches for a few minutes like I can understand straight away. My teacher teaches for a week and I can't understand the basics
reply
Add a review, comment
Other channel videos
