Astronomy - Chapter 1: Introduction (7 of 10) How to Measure Angular Size?

[@SayedMahmud-e2p]

The best teacher in business

[@MichelvanBiezen]

thank you. Glad you think so. 🙂

[@jman10110]

thanks, this was more helpful than my college astronomy class...

[@kellilynn194]

I have the same issue, way better than my astronomy class

[@nemnoton]

Exactly what I wanted to learn about, happy to have found this. I wasn't sure I would be able to follow but it turned out to be on a level that was very understandable, and well explained.

[@aldricbenalan4755]

Thank you! I was confused on arcseconds and arcminutes when I was reading the Seeds Astronomy video on how it was measured in the sky. Thanks for clearing up my confusion!

[@tysonmcvicar3829]

Great video! Now I can understand my astronomy books a bit better, by understanding the arc second and arc minute notation.

[@liv3217]

man all this time i thought he was saying electronline when it's ilectureonline. APPRECIATE THE LESSONS THO THANK U

[@MichelvanBiezen]

you are not the first one to say that. It does sound like electronline :)

[@esta.es_aanaa]

I'm appearing for the astronomy olympiad and I really found it very helpful. Thank you so much sir.

[@MichelvanBiezen]

All the best on your olympiad competition. We have been told by many who have gone before you that these videos helped them a lot.

[@Teo117]

and yet another masterpiece. I wonder the length of time required if I were to complete one episode a day. Notes included of course. Probably not long in the scheme of life.

[@MichelvanBiezen]

Enjoy the journey.

[@wiggles7976]

Another thing to add is the small angle approximation: for things that have angular size less than a degree, you can simply divide the object's physical diameter by its distance from you, and that gives you the angular size in radians. Yes, the calculation really is that simple (and has negligible error oftentimes).

[@MichelvanBiezen]

Good input!

[@jirehjoseph]

This video made me understand about arc minutes/seconds for my Astrosciences class. Thank you!

[@anarchist28]

thank you!!!!! this is so great it makes me wanna watch these just for fun.

[@hillcountrylivin]

Clear and concise explanation. Thanks

[@aryanmishra2257]

very helpful thanks was stuck in mid of my chapter ..you clarified the confusion

[@MichelvanBiezen]

Glad it helped!

[@A.MM661]

Thank you for this clear explanation sir, appreciate the explanations

[@MichelvanBiezen]

Glad it was helpful!

[@mariostroie4408]

Thank you very much, I need this for the national olympiad

[@MichelvanBiezen]

All the best on your olympiad.

[@exodian7562]

Thank you soo much this is more helpful than I expected

[@aileengetty2300]

thank you so much , you are an excellent teacher

[@MichelvanBiezen]

Thank you! 😃

[@SolidBuildersInc]

Thanks for the Presentation, Question.... What method/approach is used to measure the distance to the object (Sun, Moon, Stars, etc.) ?

[@MichelvanBiezen]

That is a complex topic. Therefore we have an entire playlist to explain that: ASTRONOMY 17A MEASURING DISTANCE SIZE LUMINOSITY This playlist can be easily found from the home page

[@kenkoskela3357]

Fantastic teaching on this... thanks for making this available.

[@MichelvanBiezen]

Thanks. Glad you enjoyed it. 🙂

[@comradeishaan89604]

can i follow it for nsea?@@MichelvanBiezen

[@HotelFlorentia2024]

Thank you, very useful. It was my 2020 resolution. Know a bit more about our universe! (and learning the Divine Comedy by heart).

[@rahulsachdeva9063]

Awesome explanation 👍

[@bertin5273]

In chatGPT i found:The angular size between Betelgeuse and Rigel, two of the brightest stars in the constellation Orion, is approximately 12 degrees.Or is it 5 degree?Thanks.

[@MichelvanBiezen]

It is closer to 5 degrees

[@shamzanasim3749]

Which books do you recommend which can give you more learning of space and rockets

[@MichelvanBiezen]

There are many good books, and it is mostly a matter of personal opinion. Almost every astronomy book will give you a good overview.

[@nicholaslamborghini9286]

So all this video is saying is that using these calculations to measure distance to celestial bodies is completely bunk?

[@wriga007]

Thank you, i was struggling to grasp arcminutes & arcseconds, not now 😁👍👍

[@MichelvanBiezen]

Glad it helped! 🙂

[@astronomyastrology7387]

Very very nice classes.

[@abhirai4680]

U are really good teacher

[@badalsingh428]

Thanks for this wonderful lecture sir

[@MichelvanBiezen]

Glad you liked it. 🙂

[@aurelliusbhat4219]

Michael how do we know that the angular measurement is 0.5

[@MichelvanBiezen]

That is just a "measured" value. We use telescopes to measure the angle to one side and then to the other side and subtract.

[@aurelliusbhat4219]

@@MichelvanBiezen bro can you make a vedio on proving it to. Tommorow

[@شريفأمجدشريفمجدي]

Thank you Great lecture 👏👏

[@technicaltrigger9641]

Is it sufficient for NSEA national standard examination for astronomy Olympiad ( India)

[@MichelvanBiezen]

We have had a lot of students writing in that they performed in an excellent manner in the Astronomy Olympiad after watching all of our astronomy videos.

[@technicaltrigger9641]

OK sir and thank you for quick response

[@whitewaterandpriscillapump688]

Great video! Your accent is also cute!

[@feynstein1004]

How are we able to measure such small angles though?

[@theplanetruth]

Feynstein 100 Great question. Maths.

[@feynstein1004]

@@theplanetruth Yeah you're gonna have to be a bit more specific than that m8 😂

[@gowdsake7103]

Glass reticules ! and accurate telescopes ! I used to work on machines with them they could position the head to 2.5 microns

[@feynstein1004]

@@gowdsake7103 Hmm more details would be helpful

[@feynstein1004]

@Memes shorts There's also a thing called not being a dick, but obviously you have no idea what it is. Hmm you know, maybe try googling it.

[@GOLDEN_GOLD2.0]

Thank you professor!

[@MichelvanBiezen]

You are welcome! 🙂

[@shaylamenter6353]

VERY helpful - Thank you so much.

[@atw_demonic819]

Hey I got a system mabye you could tell me what it is it has to do with astronomy and I cant find anything about it online

[@gowdsake7103]

Huh ?

[@217WINGoDARE]

Please write the equation to find each of the following scenarios : OB=Observer, G=12" diameter GLOBE; #1] G is 12" from OB, what is G's Angular size? #2] G is 24" from OB, what is G's angular size? #3] G is 36" from OB, what is G's angular size? #4] G is 1000" from OB, what is G's angular size? From these four answers, we can write an equation that explains the (apparent) decrease of size. Please do so, as #5].

[@planckhouse4418]

Great sir from India

[@MichelvanBiezen]

Welcome to the channel.

[@planckhouse4418]

Sir tell me one thing how we draw square root of 2 in graphical method

[@omgdataiseverything]

Sir Please upload the video of the study of the sun, I am a student of physics but from correspondence So your video help me and show interest in my subject Your video is helping in my study Please upload

[@MichelvanBiezen]

We have an entire playlist on the Sun with all the details. You can find all the playlists from the home page of the channel.

[@joneslu1377]

So clear! Thank you!

[@MichelvanBiezen]

Thanks for the feedback.

[@exhibitit724]

Thank you sir 🙏

[@MichelvanBiezen]

Most welcome

[@exhibitit724]

Sir my Son is 9 year's of age and I have told him to watch and learn from your videos and where I live the Indus Valley education system never gave a platform to study anything but copy paste all the things which were of no use so hopefully my son will achieve as he is also fond of the ASTRONOMY......So please do continue your valuable work to motivate and enlighten people like me and my son ..Thanking you love from India

[@seppbarbetta5156]

Super teacher :-)

[@MichelvanBiezen]

Thank you! 😃

[@surendrakverma555]

Very Good 👍👍👍

[@MichelvanBiezen]

Thank you 👍

[@DeepakSingh-mb9be]

wow sir nice intro

[@RazomDoPeremohy]

That arc second is a tiny little shliver!

[@MichelvanBiezen]

It certainly is. In astronomy many measurements are in arc seconds or even in fractions of an arc second.

[@hybatir9014]

This might be basic but I don't understand how to find the angle

[@thedogsmom]

Angular Size = Physical Size x (360 degrees/(2pi x Distance))

[@kevinceniceros1690]

Not to self: like this video.

[@chunghinho5812]

i learnt a lot thank you

[@mohdnomanmalik470]

Thanks.

[@kevalpadhai3545]

👍👍👍

[@MichelvanBiezen]

Thank you. 🙂

[@ojkolsrud1]

Good lecture, but it didn't really say how you'd find, say, the angular size of the Moon.

[@gowdsake7103]

Use an accurate telescope mount And multiple observations

[@AshishKumar-ew2qt]

Super sr

[@MichelvanBiezen]

Thank you

[@theplanetruth]

0:55-No, you don’t know the sun is much, much bigger than the moon. If you simply apply angular size, they are very similar. You’ve been TOLD the sun is 400x bigger, but you cannot prove that.

[@MichelvanBiezen]

Do you honestly believe that or do you just pretend to believe that in order to have a discussion?

[@theplanetruth]

@@MichelvanBiezen I don't have beliefs. I know that to be the case. Tell me, which happened first, thinking the sun must be larger than the moon, or measuring it to be so?

[@MichelvanBiezen]

So, you are not pretending? You appear to be avoiding the question. You actually think that the Sun is the same size as the Moon? (Yes or no will suffice)

[@theplanetruth]

Michel van Biezen I’m not trying to be evasive, sorry. Yes, I know the sun and moon are comparatively the same size.

[@MichelvanBiezen]

OK, I like that straight forward answer. So I can now assume that you are honestly expressing your view of the comparative sizes. Would you now agree that the Sun and the Moon have approximately the same angular size? (about 1/2 degree = 30 arc minutes)

[@freefreepalestine360]

Learn about the saros system sun and moon are local.

[@MichelvanBiezen]

We have a video on that.

[@sajdahamad9980]

THANK YOUUUU

[@nebulousJames12345]

Please be careful with that mic setup on your spine! Serious damage can be done if you fall on that

[@ZappasMudshark]

Bow ties are 😎

[@777-Phil]

Thumbs down: Teacher fails to account for angular size dynamics per se: refraction, moisture, deflection of light, Snell's Law, perspective changes, lensing (moisture magnification), Raleigh scattering, and temperature variables. Worse, he is teaching presumptive baller religion, per status quo, while waxing eloquent with angle diagrams.

[@Astronomynatureandmusic]

IMHO, explaining something in a simple way is, in fact, complex. Wouldn't you agree that the topics you mention are only learned after learning the basics? I do not understand 'baller religion'. Never heard of it.

[@gowdsake7103]

Wow what an moron YOU are You think its one measurement by one guy using one method and we are done ? You are an imbecile

[@sutterkane3264]

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