Episode 22 : How does the Surya Siddhanta explain the rising and setting of the heavenly bodies?

[@rashmivaidya864]

Beautiful explanation sir....

[@GururajParvatikar]

Such great explanation !!

[@giridantanala]

Super sir, now please start blogging as well sir. Excellent oration..learning so many things. .not only astronomy...

[@radhikaprasad8012]

Love your videos

[@100zen100]

Kishore! Great to see you after ages from RECT days. Lots of interesting topics you are covering in so easy way. You are doing great! Keep it up. Sapan Jena

[@Ahargana]

Thanks Sapan!

[@Ahargana]

Thanks Sapan!

[@ai66631]

Very nice astronomical info🙏🏽, pls post more surya siddhantha lessons Sir

[@Kartvee]

This episode is brilliant! I I have just heard of this all these years. But seeing it in animation is while different experience. Thanks for doing this. Cheers to more on this topic.

[@Ahargana]

Thank you. The core of this model is in a single verse in Surya Siddhanta. Took me some time to understand it. When I modelled it in GeoGebra I was myself amazed to see the result. Then again, these two movements are exactly what is observed from the surface of the Earth. It is the axial spin of the Earth that is hard to observe!

[@sujatharb12]

Fantastic episode. It took me a while to understand. I had to stand literally to understand about the North facing, and South facing 😀. I was reading about Perihelion, the Earth closest to the Sun occurring on January 3rd, and that this point gets drifted 1 day every 58 years. This was really fascinating, and made us think that, the seasons also change due to this reason also, right. Maybe, in future, hundreds of years later, December will no longer be Summer in the Southern tip of Australia. Hope, our calculations are right. Thanks again for your educational videos.

[@Ahargana]

Thank you! The Surya Siddhanta is brilliant and I am scratching just the surface. I have only studies the sections that pertain to calendrics. There is lots more positional astronomy - pertaining to conjunction / opposition of planets and of course eclipses of sun and moon - that I find hard going.

[@sujatharb12]

Thank You for your reply. Waiting to see more videos.

[@Ahargana]

Also, perihelion does not affect seasons. Seasons are determined by the equinoxes and solstices and these are drifting at the rate of 1° every 72 years. This "precession of the equinoxes" is discussed in Episodes 15 and 17. Because of this the seasons will indeed shift but the Christian calendar is so designed (it is a sayana calendar - i.e. with precession) that Dec will always be summer in Australia! But Dhanur Masa (sauramana) will not be summer in Australia thousands of years from now because our calendar is nir-ayana by design - i.e. without accounting for precession. To be more precise the distance of the Sun from Earth does not affect seasons; the angle at which the Sun's rays hit us - that is what affects seasons. When the Sun is directly over your head in Australia (around noon time) you have summer. In winter the Sun will move from East to West but will describe a shallow arc; it will not come anywhere near directly over your head. That causes winter. You can try observing the Sun's position at noon now and the once again at noon someday in June. You should be able to see this difference.

[@sujatharb12]

Thank you for replying, and solving my doubts. Yes, true, I have experienced Sun directly on my head during these times. Now, I understand better. Yes, we did see the episodes 15, and 17. Thank you for explaining, how the date of Makara Sankranti changed from 21st December to January 15, 2024. So, we went into the future to see the dates of Makara Sankranti using Drik Panchanga. Fascinating! In 2084, Makara Sankranti falls on 26th January! Thank you again.

[@Ahargana]

@@sujatharb12 That does not sound right. It would take ~850 years (and not 60 years) for Makara Sankanti to move by 12 days (~1 day every 72 years).

[@williamliamsmith4923]

12:36 I think it is not 4,32,000 years back, but at beginning of ahargana counting. People have calculated 22 Feb 6778 BCE. All planets are not exactly aligned but they are in Mesha Rashi at that time. (SS 1.2-4, SS 1.57) 4,32,000 years is used to as a large number against which number of rotations of various grahas are specified in integer (rather than using fractions or giving time for one rotation)

[@Ahargana]

Thanks for the correction. Lots more left for me to study in Surya Siddhanta.

[@williamliamsmith4923]

@@AharganaHave you already covered the meaning of ahargana? I don’t actually know what the number is for, say today, as calculated by Surya Siddhanta. Knowing this number as used by panchang makers would tell us when the Surya Siddhanta creators thought the planets were together. Most probably use ahargana from Kaliyuga start when planets seem to come together around 3102 BCE but not in Mesha Rashi. I found the date I mentioned before in Mr. Vedaveera Arya’s book. It seems to be start date for prior dwapar yuga and seems too late for SS mythology. Start of maha yuga is ofcourse back calculated in my view based on observations when Siddhanta was composed.

[@Ahargana]

@@williamliamsmith4923 No. I have not explained the term "ahargana" so far. This series is focused on calendrics (I.e. panchanga). Even now, I introduced the detailed astronomical model only because I am embarking on savana mana - Dina, Rathi, ahoratra - and felt this theoretical digression was appropriate.

[@williamliamsmith4923]

@@Aharganaif you know (or come to know) what is current ahargana please let me know. I found a resource on Internet but they were giving several answers based on different calculations

[@aaronluciferm1318]

Hi. Brilliant presentation, explained very eloquently just like all other videos. 👍 However, I am curious to know which verse of Surya Siddhanta explains this planetary motion? Verse 29-34? I only say this because the model you represented in the video is based on the southern hemisphere view, whereby the fast diurnal celestial motion is anti-clockwise(westward) aka "zodiac motion" while the slower sidereal motion is clockwise(eastward) aka "planet progression", both of which are completely the other way around in the Northern Hemisphere that is the former is clockwise and the latter is anti-clockwise. Having said that, from the Southern Hemisphere view, just like the model demonstrated in the video, the real motion implied by the Surya Siddhanta can be interpreted as the 24 hour ROTATION of the Earth which is indeed an anti-clockwise motion but the annual REVOLUTION of the Earth is an apparent motion because Earth like all other planets in the solar system, also revolve in the anti-clockwise direction around the Sun. But as stated earlier this astonishing astronomical truth which may very well have been implied in the Surya Siddhanta is more aligned from a Southern Hemisphere perspective of the heavens.😉 Arun from Sydney, Australia. 🙂

[@Ahargana]

Chaper 1, verses 25 and 26. "Clockwise" is a tricky term. It depends on which direction the terrestrial observer is facing. In a "observer facing North" model, East is to the right; West is to the left; diurnal movement is anti-clockwise. If I redraw it as a "observer facing South" model, diurnal movement will appear to be clockwise. All my Stellarium models are "observer facing North", as I explain in the very first episode. So is this Geogebra model.

[@aaronluciferm1318]

@@Ahargana That's right which is why I tend to use westward and eastward when referring to zodiac motion and planetary progression respectively especially given I live in the southern hemisphere. Oops sorry I missed the part about facing north which makes perfect sense because in the southern hemisphere, one sees the Sun move in the northern sky, hence the Sun moves from right(rising) to left(setting), the exact opposite is seen in the Northern hemisphere.

[@muralidharrao2711]

Wow what an episode! These models and theories broaden our understanding. Though we have come a long way from this Geocentric model to Heliocentric model to the current - "there is no perceivable center or boundary to the universe" model, this episode helps us put everything in the right perspective. Thanks for taking the effort to share with us 🙏🙏

[@Ahargana]

Thank you! The Surya Siddhanta model is brilliant. It is wrong in so many ways yet it is right in describing what we actually observe from the surface of the Earth!

[@santruptapani]

Mind blown , this is a bheja fry episode for me .

[@Ahargana]

You are not alone😊. It took me some effort to understand this model. Only after I modelled it in Geogebra, I understood it completely.

[@saiprasadekbote7353]

Very nice animation and explanation sir. I think this model of universe is close to the actual reality as explainrd in the 5th canto of Shrimad Bhagavatam, vedic cosmology.

[@skks4yt]

If my understanding after seeing the animation is correct, the rashi/nakshatra mandala rotates the fastest, followed by shani and then guru and moon is the slowest, resulting in moon 'seeming' to be fastest in the clockwise direction. If this is correct the following statement in the description threw me off "The rashi mandala (consisting of all the stars) rotates the fastest and Saturn rotates the slowest, with all other heavenly bodies being in between the two." Thank you so much for your efforts in making these episodes.

[@Ahargana]

@sujeet4yt Your understanding is perfect. I made a mistake in the description which I have corrected now. Thank you for pointing it out.🙏

[@RogerJames-h9i]

Hello Sir, this is a wonderful series, and I'm a huge fan, in light of the upcoming solar eclipse, can you talk about it in terms of jyothish?

[@Ahargana]

Thank you for your encouraging words . I have already done a video on solar eclipse over a year back: kzbin.info/www/bejne/g5e2coGwi5aLg8Usi=l07vusCL1kCdLh1v

[@KrishnaveniRamani]

We have been seeing your videos and could get answers to many of the questions with regard to many aspects of our Calendar system.Stellarium is also very good ,thanks to all of it.I have forwarded this link to many of my friends and groups. We have seen upto episode 22. I am unable to locate the subsequent videos.Any lead please?

[@Ahargana]

Thank you for your support! I am still preparing the subsequent episodes. There are some complexities regarding a day and its subdivision (nadi, vinadi and prana). It took some time for me to understand these properly. I will start releasing new episodes in Dec.

[@ramanioppuramarao6535]

Thanks@@Ahargana

[@Ahargana]

@user-qm5nz4ed1f I have released Episode 23 today. Thank you for your support.

[@manasshidore]

Suryasiddhanta thinking is so simpler than todays western theory.