anytime! So this comes from the small angle approximation, tan(x) is about equal to x in radians for small angles. These angles are about as small as it gets!
Hi, thank you for your lovely video, just double check, the parallax is the name of the angle and it measured in arc-second, and parsec is the unit of the distance between the sun and nearby star ? Do you know does OCR exam board need to remember how to convert A.U. to meter? because I don't think it is in the formula booklet. Thank you so much !
Yes both are correct! The A.U. is not in the formulae booklet, the spec is a little unclear whether you need to remember it or not (the value itself), it's 1.5 * 10^11 m, I usually remember it as 150 million km and convert. But it is often given in the questions too.
@@zhelyo_physicsThank you for the reply sir! If you dont mind, may i ask once more what if we put the nearby star farther away from the sun, what will be the assigned parallax angle? Will it still be 1 arcsecond again? If then thus it will not affect the parsec of that star?
Hi check problem 24 on here, I think the link should bring you to the right problem, it has a diagram that explains the process: ua-cam.com/video/9_uLHOYjNh0/v-deo.html Hope this helps!
@@zhelyo_physics Thank you for the reply! This help, but I still have some doubts about how that scale is in the first place made. In another video (ua-cam.com/video/obNOJIaJnfQ/v-deo.html) they mention that the angle is measured with instruments that use the same logic of a theodolite...
So we take an image 6 months apart. The object will have changed its distance with respect to the background. The distance its moved at on the image with correspond to an angle with each pixel corresponding to an amount of arc seconds. Hope this makes sense!
I am so glad i watched this video instead of glossing over it fast. It was very helpful bc you were calm etc. Thank you!
thank you for the comment, very glad to hear!
You did a great job at breaking down all the information. Most other videos were either very confusing, or spoken with a thick Indian accent. 10/10
U can’t understand Indian accent ?
It can be hard to understand someone who has a heavy accent of a different language.@@akhilr1121
Best explanation with an example as well. Bravo and THANK YOU! Good job!!!!
Thank you so much for the comment!
Thank you for video, it really cleared everything up for my astronomy test today😊
fantastic to hear! Great work and thanks for the comment!
Very good explanation. I finally understand that. Thank you!
thank you for the comment, anytime!
Very well explained. Thank you!
Glad it was helpful!
thank youu love your videos mr z physics :))
thanks a lot! Much appreciated!
Thank you for the video. How have you derived the equation d=1/p?
anytime! So this comes from the small angle approximation, tan(x) is about equal to x in radians for small angles. These angles are about as small as it gets!
thankyou very much!
anytime, thanks for the comment!
I can't thank you enough.
Glad this is helpful!
do we need to memorise the conversion from AU to METERS?
I'd recommend it even if it's not on the spec
Hi, thank you for your lovely video, just double check, the parallax is the name of the angle and it measured in arc-second, and parsec is the unit of the distance between the sun and nearby star ? Do you know does OCR exam board need to remember how to convert A.U. to meter? because I don't think it is in the formula booklet. Thank you so much !
Yes both are correct! The A.U. is not in the formulae booklet, the spec is a little unclear whether you need to remember it or not (the value itself), it's 1.5 * 10^11 m, I usually remember it as 150 million km and convert. But it is often given in the questions too.
@@zhelyo_physics Thank you so much!
May I ask why did you assign the parallax angle with 1 arc second? Why not 2 arcsecond s or 3 or 4 or 5 arcseconds?
Excellent question, no particular reason. Units are often assigned as 1 of a quantity.
@@zhelyo_physicsThank you for the reply sir! If you dont mind, may i ask once more what if we put the nearby star farther away from the sun, what will be the assigned parallax angle? Will it still be 1 arcsecond again? If then thus it will not affect the parsec of that star?
Does someone know how to measure the parallax angle from the apparent shift of the star from the background??? I can't find this info anywhere...
Hi check problem 24 on here, I think the link should bring you to the right problem, it has a diagram that explains the process: ua-cam.com/video/9_uLHOYjNh0/v-deo.html Hope this helps!
@@zhelyo_physics Thank you for the reply! This help, but I still have some doubts about how that scale is in the first place made. In another video (ua-cam.com/video/obNOJIaJnfQ/v-deo.html) they mention that the angle is measured with instruments that use the same logic of a theodolite...
HOW to measure the angle P ?
So we take an image 6 months apart. The object will have changed its distance with respect to the background. The distance its moved at on the image with correspond to an angle with each pixel corresponding to an amount of arc seconds. Hope this makes sense!