This video surveys observations, historical theories, use of a mechanical demonstration, and compares the apparent motion for all superior planets of the motion.
Galileo, Copernicus, Kepler could not predict eclipses nor planetary positions far into the future. Whereas Babylon since before 747 BC and C Ptolemy since AD 150 could. Not until Haily and Newton AD 1700 could we painfully produce more accurate results and only because we had 3000 years of geocentric data. Even NASA relies upon and cites Babylonian and ancient Chinese records.
Thank you for finally helping me understand. I think maybe it 85% make sense to me now which is SO much more progress than I've made with other videos / explanations!
As a newcomer to star watching I observed retrograde motion of Mars in either 1978 or 1979 but had no idea what was happening. Took me a few years to run across a scientific explanation and - Bingo - my riddle was solved. Very good presentation! Regards.
I am an audit and accounting student. I've recently grew an interest in astronomy so i've been watching videos related to it. Your video explained it really well. And if anyone sees my comment do recommend good beginners guide to astronomy.
You explained it very well, Tina. Thank you. It's about how we see those from distance. The sun & the moon are too far & very close, so we don't see those go retrograde. It's including galaxies, distant planets, objects. (Fri 12 Aug 2022 15h32)
Good Model for explanation....especially the motion of houses and fixed signs is good to visualize how personal charts are developed...Thanks for good video...and keep it up.
It is sometimes observed in transparent lift confusing whether we are going up or down after it stops midway, watching outside. It happens coincidentally and not consciously.
The video is amazing. Great job and thank you. The only improvement I can think of would be a tiny camera on the earth ball that would show Mars against the changing background. But that would be tricky.
2:40 So how is it at this point we are able to see Mars move across the background which are fixed stars when the Earth in your model is now facing another portion of the Stars which is not possible for us to see being as Mars is now well behind us in the Nights sky?
Didn't Einstein establish that all movement is relative and depends on frame of reference? Then how can you say that the ptolemeic system is wrong? It is an accurate description of retrograde phenomenon, just using a different frame of reference. Not the simplest one, but still working.
I really enjoy the model that you made to demonstrate this system. Starting at 2:50. Do you happen to know the gear ratios? I'm interested in making one.
For retrograde motion to take place, Mercury has to orbit slower than Earth. But isn't Mercury's orbit the fastest in 88 days? In all the visuals in the video, Mercury's orbit is shown as further out from the Sun but that isn't true right?
Retrograde is what we observe when we ride the "spinning tea cups" at an amusement park. It's a "real" phenomena, when both the observer and observed are both in motion.
Absolutely great video. However I looked many times at the last graph and still don’t get it. Why are the t=121 days positions of Earth, Mars and Jupiter projected as the position on the celestial sphere at t=0 days? It just doesn’t make sense to me. What’s the explanation or is this a mistake?
This is great but it's too bad you didn't do a second demonstration with the model, showing smooth motion that doesn't stop. Studens usually need to see things more than once. (You could edit it in, even now.)
Because all planets orbits are NOT circular. The are elliptical. So there are times when the two ellipses, earth and Mars, are closer together and then farther apart as earth passes Mars. Watch this again and think of Mars being closer to earth at some points, and then father away, like the unnamed planet that was shown, so the apparent retrograde loop is smaller.
Very good 10/10 but how does this work for inferior planets like Venus or mercury. Would it actually be considered Earth in retrograde in relation to them? Because earth has a longer orbit? Additionally could we even see mercury or Venus in this retrograde period? Or would it be during the day. I’m going to look all of this up in a couple minutes lol I’m just stating my questions here
No. Mercury and Venus both are seen in retrograde but neither of them go past the earth. Each only gets so far from the sun and then goes back the other direction. From either of them, earth would appear in retrograde as Mars and further plants appear to be from earth.
Thankyou for very thoughtful explanation. Although this makes me wonder what if the movement of the other planets like Saturn or Jupiter which seems to be normal may actually have retrograde motion.
This shows half of Earth's orbit around the Sun, but what about when Earth is on the other side of the Sun? Shouldn't Mars or other planets disappear between us and the Sun at some point?
+Chuck Norris At 2:31 she talks about Mars being at "opposition," which is when the sun, Earth and Mars are aligned with Earth in the middle and Mars on the opposite side of us from the sun. When the Earth is aligned with Mars having the sun directly in between them, i.e. with Mars on the other side of the sun, that is called a "superior/solar conjunction" at which point Mars is blocked from the Earth's view for a couple of weeks roughly every 2 years.
Thats fantastic Richard Fitt. But a greater problem appears unexplained that at if we take a point on the earth orbit to be the start point for that time it takes to go round the sun at a point quarter-way on the sun should be hidden towards the southern pole ifthe planet retains its north direction else the polar star should rise above to the equator
You guys are unbelievable. When Earth is behind the Sun but Mars is in "front" of the Sun, you should be able to observe Mars during the day and not at night. If you don't don't believe me then do what astronomer in the video did, make a model, and see for yourself. If your last objection is, the real sun is too bright for Mars to be fully visible during the day, then you will realize why we don't see many stars during day or maybe God wasn't want to you to see the stars because you're unworthy for heaven.
Margaret Sharp Earth has retrograde motion relative to Venus. And relative to Earth, Venus has phases almost like the moon except venus doesn't have either a full moon or new moon phase because the sun is between, so probably full moon Venus doesn't a thing and new moon Venus is the alignment of the sun, Venus, and Earth. Again I'm not to sure because inferior planets are less looked at.
Planets are wandering stars and consist of plasma, they are driven by the earth's electromagnetic field on their electromagnetic orbits (Van Allen belt). The so-called planetary loops occur because the stars are trapped in a magnetic bottle and collide with their own magnetic mirror during their orbit and only then pick up speed again. The earth is the center of the universe and stands still. It is extremely instructive to look at a fusion reactor in plasma physics, then you will understand it better. He didnt know electromagnetism back then, but I think he was right.
I finally understand, that demonstration was phenomenal
I teach Astronomy, and this is one of the best demonstrations I have seen explaining retrograde motion! Congratulations!!
where do you teach
Please don't tell kids that one model is right or wrong. They are only more or less complicated and more or less predictive.
Geocentrism is what we actually see, standing on Earth. Heliocentrism is easier to draw on paper. But try to do the math.
Galileo, Copernicus, Kepler could not predict eclipses nor planetary positions far into the future. Whereas Babylon since before 747 BC and C Ptolemy since AD 150 could. Not until Haily and Newton AD 1700 could we painfully produce more accurate results and only because we had 3000 years of geocentric data. Even NASA relies upon and cites Babylonian and ancient Chinese records.
Finally, a prefect explanation and beautiful visual model!
Thank you for finally helping me understand. I think maybe it 85% make sense to me now which is SO much more progress than I've made with other videos / explanations!
This is the BEST video I have come across explaining "apparent" retrograde motion of superior planets... a job very well done!
Simply love the speaker's voice. Crystal clear. What an awesome and novel effort of mechanical demo! Hats off!!!
Thanks for this video, I understand this phenomenon now due to your phenomenal demonstration and explanation.
As a newcomer to star watching I observed retrograde motion of Mars in either 1978 or 1979 but had no idea what was happening. Took me a few years to run across a scientific explanation and - Bingo - my riddle was solved. Very good presentation! Regards.
Mind blown. Thank you. This visual was Much needed! And I love the hand crank for teaching
That demonstration tool was sooo good and well explanatory
In case anyone is curious, the song is "I Don't See the Branches, I See the Leaves" by Chris Zabriskie.
Simply, brilliant! Thank you for this.
So clear and simple .. finally understood the thing .. thanks for your efforts
I am an audit and accounting student. I've recently grew an interest in astronomy so i've been watching videos related to it. Your video explained it really well. And if anyone sees my comment do recommend good beginners guide to astronomy.
czcams.com/video/MsJVNRzl0QQ/video.html
@@Almuric.Tychos Thankyou
Excellent explanation, thanks for such a great video.
Excellent presentation.
You explained it very well, Tina. Thank you.
It's about how we see those from distance. The sun & the moon are too far & very close, so we don't see those go retrograde. It's including galaxies, distant planets, objects.
(Fri 12 Aug 2022 15h32)
Good Model for explanation....especially the motion of houses and fixed signs is good to visualize how personal charts are developed...Thanks for good video...and keep it up.
this is great explanatory regarding retrograde motion. thanks
Thanks for the wonderful explanation. 🙏
Best I have seen yet
Nice Model and explanation. Thanks!
Thank you for this educational video. I learned something new.
Very helpful for astrology students. Thank you for this easy to understand excellent presentation. 🌌🌠🌜
great illustration.
Why am I watching this at 4:16 am? It all started with me wondering what would happen if earth rotated in retrograde-- 2 hours later, here we are.
thank you for this explanation! It was very helpful.
It is sometimes observed in transparent lift confusing whether we are going up or down after it stops midway, watching outside. It happens coincidentally and not consciously.
great demonstration. helpful on the journey of learning about history of astronomy^^
very great explanation of retrograde motion!
very beautifully explained!
The video is amazing. Great job and thank you. The only improvement I can think of would be a tiny camera on the earth ball that would show Mars against the changing background. But that would be tricky.
Very well explained! Thanks
Couldn't have been any better
Excellent demonstration.
SO SICK!!!
Thank you so much, such a great explanation ❤️
Very helpful for my astronomy olympiad
Thank you. Well done.
Great demonstration!
a very useful movie I am grateful thanks
Outstanding presentation 👏👌👍
That was well explained. Cheers major. Gen Harry
Thanks. I shared this video on my social media accounts.
Nice and understandable expiation.
very brilliant explanation
Thank You so very much
God Bless You
I'm in love with the speakers voice.
Why are you not in love with creator 😊
Too feminine.
Great information vedio. Thanks
completely Excellent video
man why wasn i taught that in school. this super interesting! the model is really cool!
Just great! I hope now someone could connect this phenomena with astrological explanation.
Thanks indeed!
good video thanks for sharing..
Great explanation!
BRILLIANT !!!
Great video
Great Illustration... Jai Ho!
2:40 So how is it at this point we are able to see Mars move across the background which are fixed stars when the Earth in your model is now facing another portion of the Stars which is not possible for us to see being as Mars is now well behind us in the Nights sky?
Didn't Einstein establish that all movement is relative and depends on frame of reference? Then how can you say that the ptolemeic system is wrong? It is an accurate description of retrograde phenomenon, just using a different frame of reference. Not the simplest one, but still working.
Thank you for this amazing explanation! I'd like to have your permission to embed this video on our website. :)
planets have 360 degree wobbling along the plane of revolution.
I really enjoy the model that you made to demonstrate this system. Starting at 2:50. Do you happen to know the gear ratios? I'm interested in making one.
Tha ratio is probably the same as the ratio of the periods of the 2 orbits.
Got it. Thanks!
amazing thank you!
Is there any software available to see the movement of other planets seen from the earth. (the top view)
Thank You
Thank you
Bravo!
Great video thanks, I love science it’s far out👌
For retrograde motion to take place, Mercury has to orbit slower than Earth. But isn't Mercury's orbit the fastest in 88 days? In all the visuals in the video, Mercury's orbit is shown as further out from the Sun but that isn't true right?
Thnx 4 sharing
good explanation
Retrograde is what we observe when we ride the "spinning tea cups" at an amusement park. It's a "real" phenomena, when both the observer and observed are both in motion.
thankyou sensei
Absolutely great video. However I looked many times at the last graph and still don’t get it. Why are the t=121 days positions of Earth, Mars and Jupiter projected as the position on the celestial sphere at t=0 days? It just doesn’t make sense to me. What’s the explanation or is this a mistake?
This is great but it's too bad you didn't do a second demonstration with the model, showing smooth motion that doesn't stop. Studens usually need to see things more than once. (You could edit it in, even now.)
Good explanation
please demonstrate why Mar's retrograde period is variable. It is not always 72 days. It's angular loops size also changes.
Because all planets orbits are NOT circular. The are elliptical. So there are times when the two ellipses, earth and Mars, are closer together and then farther apart as earth passes Mars.
Watch this again and think of Mars being closer to earth at some points, and then father away, like the unnamed planet that was shown, so the apparent retrograde loop is smaller.
@@rickkwitkoski1976 That is not a demonstration sir.
Nice explianation
I got the answer right. Even tho it wasn’t because the same reason but I’m so happy and glad I got it and understand it 🎉🎉😊💜
Wow, you killed that shit, perfect explanation.
So helpful!!
What about interior planets? Does the same logic apply like mercury went in retrograde yesterday 9th September 2020.
Not quite
Try turning that flat disk motion explanation into a 3D explanation.
Beauty
Good stuff babe
Very good 10/10 but how does this work for inferior planets like Venus or mercury. Would it actually be considered Earth in retrograde in relation to them? Because earth has a longer orbit? Additionally could we even see mercury or Venus in this retrograde period? Or would it be during the day. I’m going to look all of this up in a couple minutes lol I’m just stating my questions here
No. Mercury and Venus both are seen in retrograde but neither of them go past the earth. Each only gets so far from the sun and then goes back the other direction.
From either of them, earth would appear in retrograde as Mars and further plants appear to be from earth.
Tqsm madam
Thankyou for very thoughtful explanation. Although this makes me wonder what if the movement of the other planets like Saturn or Jupiter which seems to be normal may actually have retrograde motion.
This shows half of Earth's orbit around the Sun, but what about when Earth is on the other side of the Sun? Shouldn't Mars or other planets disappear between us and the Sun at some point?
They change facts to fit the theory.
+Chuck Norris At 2:31 she talks about Mars being at "opposition," which is when the sun, Earth and Mars are aligned with Earth in the middle and Mars on the opposite side of us from the sun. When the Earth is aligned with Mars having the sun directly in between them, i.e. with Mars on the other side of the sun, that is called a "superior/solar conjunction" at which point Mars is blocked from the Earth's view for a couple of weeks roughly every 2 years.
Thats fantastic Richard Fitt. But a greater problem appears unexplained that at if we take a point on the earth orbit to be the start point for that time it takes to go round the sun at a point quarter-way on the sun should be hidden towards the southern pole ifthe planet retains its north direction else the polar star should rise above to the equator
Yes. They do disappear.... not sure what you're asking
You guys are unbelievable. When Earth is behind the Sun but Mars is in "front" of the Sun, you should be able to observe Mars during the day and not at night. If you don't don't believe me then do what astronomer in the video did, make a model, and see for yourself. If your last objection is, the real sun is too bright for Mars to be fully visible during the day, then you will realize why we don't see many stars during day or maybe God wasn't want to you to see the stars because you're unworthy for heaven.
This makes it easy to understand the superior planets retrograde but what about, Venus?
Margaret Sharp Earth has retrograde motion relative to Venus. And relative to Earth, Venus has phases almost like the moon except venus doesn't have either a full moon or new moon phase because the sun is between, so probably full moon Venus doesn't a thing and new moon Venus is the alignment of the sun, Venus, and Earth.
Again I'm not to sure because inferior planets are less looked at.
Mars:
Moon: "On your left!"
This is crazy
Smart
distance in space is so cool
1:34 I'm amazed at how he got that model, it is incorrect, but genius
Why Does mars takes longer time to retrograde than the other outer planets?
👍
the effect is due to a faster motion of earth in relation to Jupiter?
Tq
I'm with Ptolemy on this one.
Planets are wandering stars and consist of plasma, they are driven by the earth's electromagnetic field on their electromagnetic orbits (Van Allen belt). The so-called planetary loops occur because the stars are trapped in a magnetic bottle and collide with their own magnetic mirror during their orbit and only then pick up speed again. The earth is the center of the universe and stands still. It is extremely instructive to look at a fusion reactor in plasma physics, then you will understand it better. He didnt know electromagnetism back then, but I think he was right.
lol @@GeorgChristophLichtenber-jg1zr