Such a beautiful and clear explanation with simple and clean 3D view for further references! Thank you so much! Was eagerly searching for something like this. This helped me a lot :)
everything was clear till 9:30 when you ask where is the periapsis the point that you already explained that it is positioned at the closest distance from the center of earth to the orbit at the point where you pointed the question mark . but thank you a lot for the simplicity and conciseness of the lecture . from Algeria .
also 13:38 where he marks the periapsis on the old orbit, but circularizes to the apoapsis and still draws the line through his original periapsis - thats not how it works lol. But we go with it, tough subject, good video.
Alright, regarding the change of the periapsis, I can explain: Up till that point, what he explained is the size of the ellipse, the shape of the ellipse, and the oriantation of the Orbital Plane in Space. What is missing now is the orientation of the ellipse itself inside that Orbital Plane. The Orange Ellipse that you see in the video can be rotated around its center, which means that the Apoapsis and the PeriApsis will rotate as well. This also means that depending on that rotation angle, the PeriApsis can be below, above, or in the Equatorial Plane. The same applies to the ApoApsis. This is why it is necessary to define an additional angle called the "Argument of Perigee", to specify the current location of the Periapsis, which specifies the orientation of the Ellipse inside the Orbital Plane. I hope that is clear enough.
8:48 to completely determine the orbit one parameter is missing. Its the location of the perigee / argument of periapsis (little omega). It is the angle from the RAAN to the perigee as you mentioned afterwards. The true anomaly locates the exact position on the orbit
Angle for argument of periapsis is explained wrong. It continues to go more counter clockwise till it reaches to the most nearest point to the earth. Can you check it once again?
I can't understand the RAAN. I mean, it's clear on the explanation, but during a design, when should I choose this and what criteria use? Aries change along the Earth orbit?
Thank you so much! My professor explained it well, but we really could've used some 3D drawings during class! I understand everything perfectly now. :)
at 5:15: what does this acutally mean "the axis points to the vernal equinox". .. I thought that the vernal equinox is the position of the earth on the first day of spring. So what about the direction of this axis on precisely that day?
Instead of vernal equinox replace with "vernal point" or "first point of aries". you can trace a straight line from the center of the earth in the moment of north hemisphere spring equinox that goes by the center of the Sun and ends in the opposite point of the earth orbit. Then you use the Sun as center of coordinates and re-trace the half of that straight line above mentioned that connects the Sun with the opposite point of the earth orbit (pretty much the point where the autumnal equinox will take place). But instead of ending the line there, you project the line until the stars. That way you can know to which group of ecliptic starts (either aries, taurus, geminis, so on) the vernal equinox axis is pointing to at a given moment. Let's say the axis is pointing to the pisces constellation nowadays. Well, to make a long story short, because of the axial precession motion of the earth (precession of the equinoxes) we know that the axis shift one degree per 72 years, in "backward" direction (it moves from pisces to aquarius instead of from pisces to aries). 25772 years takes to cover the entire revolution and return to the position it's currently pointing to. With that data you can know the position at any moment. The shifting is very slow so it barely changes unless you are moving centuries ahead or past in time. Take into consideration also that for the thirteen main ecliptic constellations, some are greater in size that others so it's not that they are exactly 27,7° degrees each other so it takes more time for the vernal point to cover the entire ecliptic size of some constellations and less time to do the same with others (I think that for example scorpius is quite short, and virgo is long so it'd take less than the average to cover scorpio and more than the avg time to do same with virgo).-
"You know that this is an eliptical orbit because, 1. I said so".. This is America, so drop the childish arrogance. You are not in Bangalore anymore. 😝
![[FULL EP.16] เซียนพาลุย "เผือก-ฟรอยด์" กรี๊ดลั่น จนปูหนี | เฮ็ดอย่างเซียนหรั่ง | One Playground](http://i.ytimg.com/vi/FsqUvwS3b-Y/mqdefault.jpg)
Brilliant! Really clearly explained, lecturers take note!
Concise and clear, you hero
Such a beautiful and clear explanation with simple and clean 3D view for further references! Thank you so much! Was eagerly searching for something like this. This helped me a lot :)
everything was clear till 9:30 when you ask where is the periapsis the point that you already explained that it is positioned at the closest distance from the center of earth to the orbit at the point where you pointed the question mark .
but thank you a lot for the simplicity and conciseness of the lecture .
from Algeria .
same here, bit confused about the periapsis changing
also 13:38 where he marks the periapsis on the old orbit, but circularizes to the apoapsis and still draws the line through his original periapsis - thats not how it works lol. But we go with it, tough subject, good video.
Alright, regarding the change of the periapsis, I can explain:
Up till that point, what he explained is the size of the ellipse, the shape of the ellipse, and the oriantation of the Orbital Plane in Space. What is missing now is the orientation of the ellipse itself inside that Orbital Plane.
The Orange Ellipse that you see in the video can be rotated around its center, which means that the Apoapsis and the PeriApsis will rotate as well. This also means that depending on that rotation angle, the PeriApsis can be below, above, or in the Equatorial Plane. The same applies to the ApoApsis.
This is why it is necessary to define an additional angle called the "Argument of Perigee", to specify the current location of the Periapsis, which specifies the orientation of the Ellipse inside the Orbital Plane.
I hope that is clear enough.
It looks like until the day the three body problem is resolved, orbits will continue to be a physical impossibility
A much needed visualisation. Many thanks!
This is the best explanation of orbital elements that I have ever had the pleasure to rendezvous with.
I have no words to thank you! Thanks a ton, man!
OMGGGGGGG where were you when I gave my Satellite Geodesy Exam...... This could've made it super clear.
8:48 to completely determine the orbit one parameter is missing. Its the location of the perigee / argument of periapsis (little omega). It is the angle from the RAAN to the perigee as you mentioned afterwards. The true anomaly locates the exact position on the orbit
I had trouble understanding what argument of periapsis was. This made it clear for me. Thanks a lot!
Thank you for a clear explanation! I was stuck on this topic for so long and finally got the understanding.
Great simple presentation! Bravo!
What is the ascending node for an orbit which lies in the equatorial plane? Or does it not exist??
Thank you! Very clear. When one picture is worth a million words...
The most clear definitions I have found. Thanks much.
Excellent!
Thanks
I had been stuck on the argument of periapsis for a while now. This finally make it click.
There is one mistake in this video. The intersection point between orbital plane and equatorial plane is the vernal equinox.
How do we know this? First, because I said so. Second, because it looks like it. Love it! Very well explained video, thank you!
it cleared all my misconceptions about orbital elements...Thanks a lot for uploading this video....
Good job! you beat my professor in explaining orbital parameters
Beautifully explained
Thank you very much! The explanation was lucid and crystal clear. This really contributed to getting my basics straight. Cheers!
Angle for argument of periapsis is explained wrong. It continues to go more counter clockwise till it reaches to the most nearest point to the earth. Can you check it once again?
Excellent, wish this was around when I started satellite communications.
That was brilliant. Thank you so much.
Don’t you mean the length of the lines denoting the periapsis and apoapsis? These distances don’t possess radii.
What a clear explanation !!!
Thank You very much for the explanation
very well explained, now i understand my orbits in KSP :D
I can't understand the RAAN. I mean, it's clear on the explanation, but during a design, when should I choose this and what criteria use? Aries change along the Earth orbit?
Are elements 5 and 6 counted clock wise if the satellite is in retrograde orbit?
GREAT 👍
That was really good! Thanks! Super clear.
Thank you very much! A very clear explanation.
lol :D description..!!!
"Because one I said so" best comment ever.
Very Clear and Helpful, Thank You Very Much
Thank you so much! My professor explained it well, but we really could've used some 3D drawings during class! I understand everything perfectly now. :)
Excellent explanation, thank you.
at 5:15: what does this acutally mean "the axis points to the vernal equinox". .. I thought that the vernal equinox is the position of the earth on the first day of spring. So what about the direction of this axis on precisely that day?
Instead of vernal equinox replace with "vernal point" or "first point of aries". you can trace a straight line from the center of the earth in the moment of north hemisphere spring equinox that goes by the center of the Sun and ends in the opposite point of the earth orbit. Then you use the Sun as center of coordinates and re-trace the half of that straight line above mentioned that connects the Sun with the opposite point of the earth orbit (pretty much the point where the autumnal equinox will take place). But instead of ending the line there, you project the line until the stars. That way you can know to which group of ecliptic starts (either aries, taurus, geminis, so on) the vernal equinox axis is pointing to at a given moment. Let's say the axis is pointing to the pisces constellation nowadays. Well, to make a long story short, because of the axial precession motion of the earth (precession of the equinoxes) we know that the axis shift one degree per 72 years, in "backward" direction (it moves from pisces to aquarius instead of from pisces to aries). 25772 years takes to cover the entire revolution and return to the position it's currently pointing to. With that data you can know the position at any moment. The shifting is very slow so it barely changes unless you are moving centuries ahead or past in time. Take into consideration also that for the thirteen main ecliptic constellations, some are greater in size that others so it's not that they are exactly 27,7° degrees each other so it takes more time for the vernal point to cover the entire ecliptic size of some constellations and less time to do the same with others (I think that for example scorpius is quite short, and virgo is long so it'd take less than the average to cover scorpio and more than the avg time to do same with virgo).-
@@lea1822 brilliant, thanks!
where are the first 2 parts?
this video helps me alot ..short and simple ,thanks alot
Great video!!!!
excellent
Very helpful thanks
fantastic explanation and diagram
Awesome! You made it simple
osm explanation...
Thanks you very much
Спасибо thanks from Moscow
Awesome! Thanks.
Thanks a lot man. Very well explained
Very helpful video! Thank you!
Nice
A great video!
amazing!
very well explained!
Great video. Thanks
Thank you so much omg
Best ever lecture
saved me a precious half an hour
helpfully understandable
T U
thank you so much! very very veeery useful! i dont usually comment on youtube videos, but when i do, it's because the video was amazing
very nice ! tnx!
:)
Bro I just wanna play fuckin Kerbal
I hope you have fun!
Good video
Thanks!
tyvm
15 persons believe the Earth is flat.
thanks bruh
good.. helped a lot
who is the single person on earth that disliked the vid!
flat earther
Flat Earthers*
5 flat earthers
People are still watching this after 5 years? Wow the video must be that good.
Aerospace students who are being assigned to watch this
Because one, I said so! Lol
450!
"You know that this is an eliptical orbit because, 1. I said so".. This is America, so drop the childish arrogance. You are not in Bangalore anymore. 😝
Terrible unclear explanation