Bharat Rakshak

sudarshan

For fun: Asked about length of Lunar months, Now there are hree types of years: 365.25636 days 365.24219 days 365.25964 days Challenge Q - Explain? OK, looking at your post in the math dhaga, I think these should be as follows: 365.25636 days-----------------Sidereal - earth comes back to same posi...

sudarshan

Great explanation, thanks. But mathematically, I think three of the signs got reversed, the numbers don't work out: Synodic Month (29.5306 days) - Average Value https://pbs.twimg.com/media/F4ze_B5W8AAMZQK?format=jpg&name=medium Anomalistic Month (27.5545 days) https://pbs.twimg.com/media/F4zgyz5...

sudarshan

While I was listening to PM Modi's speech (Youtube link is here in many of the posts), I was happy that he asked newer generation to study scientific texts like Surya Sidhanta - *and* modern scientific data and how these can be brought into modern scientific language. So just for fun, here is a cha...

sudarshan

Also, it's fascinating that the solar panels were able to gather enough energy for this laser pulse. It's unlikely that the energy could be stored in capacitors for that long, all the way from earth over 40 days.

sudarshan

IR is too low energy for orbital transition and is likely solely vibrational. I can’t think of elements or compounds that have an IR emissivity when irradiated by visible light, akin to the Stokes shift. Must be examples. No, I think the method relies on generating plasma where pretty much all comp...

sudarshan

Amber G. wrote: ↑30 Aug 2023 00:02

The interrogation is in the UV/ visible/ near IR range, which means the method is identifying electronic transition energies, not vibe-rotational?

sudarshan

Amber G. wrote: ↑27 Aug 2023 21:35 May be missing the whole thing, or looking at wrong picture, but the picture I see, all depth measurements are in mm.... (not cm)..

Oh good lord

. Yes, that's mm, not cm. So then please disregard my previous blather, sorry. (I edited my earlier posts).

sudarshan

The temperature above the ground cannot be warmer than the temperature of the ground surface. (The only other source of energy to the thermometer would be direct sunlight, and typically temperatures readings are not taken in sunlight- but this may be an exception here and was a bit surprised to see...

sudarshan

Ye to kaam karna chalu kiya !!! https://twitter.com/isro/status/1695725102166671448/photo/1 Why would the temperature increase above the lunar surface relative to the surface. The heat on moon surface is entirely due to the solar radiation absorbed by the moon surface. I guess the above-the-surface...

sudarshan

While I was listening to PM Modi's speech (Youtube link is here in many of the posts), I was happy that he asked newer generation to study scientific texts like Surya Sidhanta - *and* modern scientific data and how these can be brought into modern scientific language. So just for fun, here is a cha...

sudarshan

We will know much better values of temperature after Vikram's measures it. (I will be surprised that it is that moderate as you suggest... LRO has mapped the surface of the moon to estimate temperatures at different lattitude.... Actually, the figures which you posted do show that it is that modera...

sudarshan

The daytime temperatures can soar to about 120 degrees Celsius while nighttime temperatures can plummet to as low as -173 degrees Celsius. As there is no air, rise and fall are much sharper. (Shade etc makes quite a bit of difference in daytime temperature ) AmberG ji, the daytime temperatures can ...

sudarshan

thanks! sudarshan for this analysis. what would be the maximum day time temperature at this location? and the minimum night time temperature? Actually, the lengths of the shadows provide great corroboration for the fact that the lander is at around 70 deg. (South - but could also be North) latitude...

sudarshan

See how bright it is at the top right of the video. That's with a 12% reflectivity, essentially looks the same shade of white as the moon itself from earth. That's the level of incident solar flux on the earth/ moon, the atmosphere essentially protects us from a lot of that. Without the atmosphere, ...

sudarshan

Obviously this is guesswork based on pictures, but all pictures tell a story. Yes they do. In fact, the lack of an atmosphere on the moon makes it easier to infer more of that story. For example - the shadow of the rover wheel is roughly 2 to 2.5 times longer than the wheel itself. So - assuming le...

sudarshan

Have popcorn ready when you watch the above, but be careful, you might choke on your own laughter.

sudarshan

Exactly. That six million magic figure is pulled from the a$$ of some woke prof. It's a little more than that, is what I'm saying. It could very well be a covert attempt to get readers to subconsciously link "casteism" to "nazism." Sounds far-fetched, but as far as they are conc...

sudarshan

krithivas wrote: ↑15 Aug 2023 02:25 There are around 4 million people of Indian origin in the USA - 6 million Americans discriminated? Madrassah Math? Lahori Logic? // Google did not yield anything either.

You don't need to google. Here's a hint. How many Jews were killed during the holocaust?

sudarshan

Actually, my <0,8> case above leads to two more solutions: <0,8> means one rectangle has sides <2 x 2>, the other has <3 x 10> or <4 x 6>. The areas don't match in either case. This isn't quite right. If one rectangle has 0 interior 1 x 1 squares, then its sides can be <1 x N> or <2 x N>, where N ca...

sudarshan

Very Nice.. but how about boys (2,15), girls (3,10) ? :) ) (There may be more :) Yes, I just came here to admit that there was an error in my previous reasoning. This specific jump is not justified: Then we have: a*b=c*d=(a+b+c+d), or (a*b)+(c*d)=2*(a+b+c+d), which means the sum of the areas of bot...

sudarshan

Oh, I see. If a, b, c, d are all different, then we can think of two different rectangles. One of size a x b, other of size c x d. Then we have: a*b=c*d=(a+b+c+d), or (a*b)+(c*d)=2*(a+b+c+d), which means the sum of the areas of both rectangles has to be the sum of perimeters of both the rectangles. ...

sudarshan

Let boys be <a,b>, girls be <c,d>. a*b=c*d=a+b+c+d General case: a, b, c, d are all different. Or: a=c, b=d If a=c and b=d, one has: a*b=2*(a+b) a*b can be interpreted as the area of the rectangle of sides a and b. Which means the perimeter of the rectangle, being 2*(a+b), has to be equal to the are...

sudarshan

I was going to post links to Hindi videos on railway station development in India, but realized that many of them are already in the railways thread. Here are a couple: https://forums.bharat-rakshak.com/viewtopic.php?t=7141&start=4552 https://forums.bharat-rakshak.com/viewtopic.php?t=7141&st...

sudarshan

Haresh wrote: ↑26 Jul 2023 20:19 ...

Great initiative! Infrastructure-related videos pertaining to rapidly-developing areas of India are a good pick for creating aspirations among village folk. Here's a suggestion:

I've seen a couple of these in Hindi, will look for them and post more.

sudarshan

Wow. How much time did you spend on this? I played with it in Excel for ten to 15 mins and managed to figure out the basic principle of x_n+2 being the same as x_n+1, if one wanted the a's to be consecutive integers. Then I slept on it, and in the morning I opened up MS Word, and the whole thing wr...

sudarshan

sudarshan

For the lurkers:

sudarshan

https://www.youtube.com/watch?v=Ob_lIQRAnYM Dec 13, 2022 A scholarly study found that British colonialism caused approximately 165 million deaths in India from 1880 to 1920, while stealing trillions of dollars of wealth. The global capitalist system was founded on European imperial genocides, which...

sudarshan

The above is the reason why the practice of "Johar" started in India (remember Rani Padmini and the other women in the palace). And below is a clue to how the practice of "child marriages" started in India. Link If you want to know how the practice of "throwing babies to the...

sudarshan

'India needs educated PM': Arvind Kejriwal targets Narendra Modi in Assam Notice the tone of the b*****d. Fellow seems to imply that only IIT-IIM wallahs have education and can rule a country.... Pet peeve triggered.... People need to stop confusing "education" with "vocational train...

sudarshan

:?: All these points made by Karolina are good indeed. But don't really show any bias within the WHR itself. The latter is based on primary sourced data from Gallup and that makes it very hard to counter with issues related to racial or sexual discrimination. . . . But what's effing the score for d...

sudarshan

But have per capita perverse behaviour that will be way off the charts compared to many south bloc countries. Per-capita-wise, Sweden is pretty much the rape capital of the world. "Girl with the Dragon Tattoo" was about this. The things depicted in the book, while making for shocking read...

sudarshan

These things should be countered, and I'm working on how that can be done...any suggestions in that direction would be most useful. Thanks Here's something you can use about the "happiest countries" (esp. Finland): zHDMHxxYmV8 Especially from about 5:30 - treatment of indigenous people (S...

sudarshan

2023^2-b^2 is even, so b has to be odd So b ends in 1, 3, 5, 7, 9 b^2 ends in 1, 9, 5, 9, 1 2023^2-b^2 ends in 8, 0, 4, 0, 8 But 2023^2-b^2=2*a^2 So a^2 ends in 4/9, 0/5, 2/7, 0/5, 4/9 a^2 can't end in 2 or 7 for any a, so that rules out b ending in 5 b has to end in 1, 3, 7, or 9 a^2 ending in 4 im...

sudarshan

273 448 - a little after Fa Hian 840 952 1008 1071 1127 - leading up to Slave dynasty (1206 - 1290) 1344 - Tughlaq dynasty (1321 - 1413) 1428 - Sayyid dynasty (1414 - 1451) 1575 - https://en.wikipedia.org/wiki/1575 March 3 – Battle of Tukaroi: The Mughal Empire decisively defeats the Karrani dynasty...

sudarshan

ASIDE: since we're talking about Gaussian primes, integers of the form 4k+1, 4k+3, etc. - a simple trick for getting the remainder of any integer, upon division by 4. Let's take a long number: 7582950732103932491 Is this a Gaussian prime, or not? I.e., is it of the form 4k+3, or 4k+1? What is it's r...

sudarshan

Didn't know about Gaussian primes before, but golly, they look interesting. I guess Pythagoras' theorem applies to their study, because the modulus of a complex number is essentially the hypotenuse of the right triangle with the real and imaginary parts as the other two sides? From what I understood...

sudarshan

^^^ Important clarification: "Two face diagonals" here means, two diagonals on the *same* face (which are equal in anycase). (IOW if one can find all sides integers, and one diagonal integer, another diagonal is automatically an integer." Oh in zat caze zere are zo many zoloozions......

sudarshan

If the main diagonal is 2023 (an odd number), and all the sides are integers, then: 1. either one side is an odd integer, and the remaining two are even or 2. all three sides are odd integers For case 2. - if all three sides are odd integers, and if two face diagonals are also integers, then these t...

sudarshan

It's so ironic that it's the Omicron variant rampaging China. It was of course made way worse by the policies of CPC president Xi, who favored political and face-saving considerations over practicality and citizen welfare. Starting from Alpha, the variants were named after letters of the Greek alpha...

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