Uttarayan and Dakshinayan - Northward and Southward Movement of Sun - Working Model
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- čas přidán 27. 05. 2022
- In an earlier video, we explored the movement of the Sun, Earth, and moon.
As you know, the Sun rises in the east everyday. But this location in the east shifts throughout the year. This is clearly visible in the animation captured on Stellarium.
This shift is mainly due to the tilted axis of the Earth.
Let us try to understand the shift in this rising location with the help of a model.
This plate mounted with gears can be rotated by hand.
Gears ensure that the axis of the earth orients properly.
Spoke acts as an axis of the Earth, tilted at an angle.
Observe orientation of the axis as we rotate it once.
This large ball is our Earth. We will mount another phone on the large ball.
Camera on this phone will capture the position of the sun as it rises on the horizon in the morning.
Flashlight of the phone will act as our Sun. Let us place it in the centre.
Here is how months are arranged on the dial.
21st March - Vernal Equinox
21st June - Summer Solistice
23rd Sept - Autum Equinox
22nd Dec - Winter Solstice
Let us start from the 21st of March . Vernal Equinox. Days and nights are equal .
21st June - Longer days and shorter nights in the northern hemisphere.
21st Sept - Another Equinox - days and nights are the same.
21st Dec - Longer nights and shorter days in the Northern Hemisphere.
Let us start with 21st March. Sun rises at this location .
Left frame shows the top view while the right frame shows the sunrise as seen from the Earth.
As earth revolves around the sun, Sun continues its Northward journey.
On 21st June, it has reached its extreme position on the North side.
From this day onwards it starts its southward journey, popularly known as Dakshinayan.
Let us view the location from where the sun rises at these locations.
On 21st Sept, it is at the same position as that of 21st March. This is also the autumn equinox.
It continues its southward journey till 22nd Dec. Now it is at its extreme position .
Sun will start its Northward Journey from this day. This is also known as Uttaryan.
Sun rises again at the same location on 21st March.
Here is a snapshot of all the locations as seen from earth for your reference.
During this capture, we placed our camera on the equator. It will be interesting to view the sunrise from other locations throughout the year.
Just like sunrise, you can try sunsets as well.
If the earth didn't tilt, every day would be an equinox, as the sun would always be closest to the equator. There would not be winters or summers as we know them,
How about different tilt angles for the Earth's axis.
Give it a try.
Have a nice time.
Thank You.
Amazing. I wish all teachers teach like this. GOd bless you.
Superb explanation and we appreciate the efforts of teaching in model form.. i really wish all teachers to teach like this.. this will drive kids towards learning
Thanks for your feedback
अत्यंत सरलता से समझाया है 😊 धन्यवाद
Excellent representational set up.. explains very clearly..
Excellent presentation sir….you are simply great!!! Very easy to understand to a Common man👌🙏🏻
Excellent presentation ❤
A brilliant explanation. Thanks a lot sir
Well demonstratrated. Thank you.
❤
जय श्री राम
Good way of persuasion.
Opened my eyes !!!thanks sir
Explained brilliantly
Great explanation
Excellent video
🎉
Woah🔥🔥🔥
Amazing explanation sir❤
Amazing experiment to show this interesting fact !!! Thank you
Thank you
Thank you. Video helped a lot
Interesting... My daughter studying 4th standard... she understood easily...
Interesting and informative sir
Very Good Demonstration.
Awesome
Great to know this
Nice 😊
Wonderful sir
my son loves this!!!!
शानदार, इसे हिंदी में भी बनाएं।
आप बहुत अच्छा काम कर रहे हैं
Nice activity sir
Intresting! I understand easily by your explanation
Glad to hear that!
Very good sir
Thanks and welcome
Best video ❤️
Thanks. Actually Uttarayan starts on 22nd Dec and not on Makarsankranti as widely believed.
Excellent. Sir, perhaps a difference between tropical calendar year and sidereal year would help, unless jot already done.
Thanks. Yes, Video on Calendars. That is planned and is in my TODO list.
@@RavindraGodboleThank you very much sir. will eagerly wait for that one.
Though I cannot grasp the whole idea, it’s amazing ! Sir, kindly upload a video with the 12 castellations so that the real positions of earth w.r.t. pole star can be visualised . Honour to you for the effort.
Thanks. You can watch my video about sun Earth Moon, which discusses how sun travels through these constellations
🙏🙏🙏🙏🙏
I experienced this
Sir can you please make such demonstration for how moon shifts its path when seen from same point on earth for a whole lunar month.. Also how time of moon's rise and its set time changes
Thanks for the suggestion. Shift in the location is partly addressed in this video. czcams.com/video/dkKPEyrD_90/video.html
@@RavindraGodbole Thankyou sir 🙏
I understand whatever happened but my question is why was the position of sun shifting? due to what was it shifting?
Revolution of the Earth and it's tilted Axis
Makar sakranti is on 22 December not 14 January..
Makar Sankranti and Uttarayan are two different things.
Sun enters Makar Rashi from 14th of Jan. Please refer to this video for the same. czcams.com/video/dkKPEyrD_90/video.html
Uttarayan starts on 22nd December.
Very long time back, these two were related but due to movement of related stars and Earth's axis, dates do shift over a period of few centuries.
Hope this helps.
कृपया इस का ट्रांसलेशन हिन्दी में करें तो बहुत अच्छा होगा इससे अनेक जिज्ञासु कि जिज्ञासा का समाधान हो जाएगा क्योंकि यह विषय एक वैज्ञानिक के साथ धार्मिक भी ओर यह वेदिक ज्ञान पर आधारित है चुकी भारत में वेदिक काल से काल गणना का काम वेदिक पद्धति से किया जाता है लेकिन अब वेदिक को जानने वाले व समझने वाले कुछ ही सिमीत मात्रा में उपलब्ध है इस लिए आप हिन्दी में अनुवाद कर सकते है तो बहुत अच्छा होगा सब को समझ आ जाएगा
czcams.com/video/v65bPTGG9cg/video.html