Talk:Hindu units of time

Time dilation

The section on time dilation that gives Lord Brahma's year as = 311trillion 40 billion years is wrong. That is not his year but total life span.24.139.24.163 (talk) 22:50, 22 December 2020 (UTC)

Good find. I've fixed it. The values were based on 100 years as opposed to 1 year. Jroberson108 (talk) 01:56, 23 December 2020 (UTC)

Clean up

Modern units of time are well defined using physical phenomena(such as the second) but Hindu units use mostly fractions to define them. (Like 30 muhurta = 1 day-and-night). How did they define muhurta? How did they define a day an night? Fractions are not exactly how modern physics define units of time. ChandlerMinh (talk) 23:52, 2 April 2021 (UTC)

@ChandlerMinh: I assume you are referring to these sections: "Sidereal Metrics", "Lunar Metrics", and "Tropical Metrics". Although I cleaned up their formatting (table, italic, IAST, etc.), I didn't add their content or check the references and calculations, something still on my to-do list. I did find some of the primary sources, which are quoted in the "Sources" section and can answer your questions. Jroberson108 (talk) 17:58, 3 April 2021 (UTC)

@Jroberson108: my concerns are about using the terms “seconds” and “microseconds”here to define smaller units of time keeping in ancient times. The second

is defined as being equal to the time duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the fundamental unperturbed ground-state of the caesium-133 atom.

while the ancient units use vague definitions like “wink of an eye”, time taken for “a needle piercing a lotus petal” etc. They cannot be equated with well defined units such as the second. ChandlerMinh (talk) 04:45, 4 April 2021 (UTC)

@ChandlerMinh: If you are referring to the approximate SI unit values that someone added, it doesn't appear to cause any confusion since the definition is also present. It serves to express the definition in units we are accustomed to, especially for persons unfamiliar with the terms. If it's calculated in the referenced sources, then it should be fine. — Preceding unsigned comment added by Jroberson108 (talk • contribs) 05:52, 4 April 2021 (UTC)

@ChandlerMinh: Approaching from the other end makes more sense. Start with a sidereal rotation of the earth on its axis. One sixtieth of that is a nadi. One sixtieth of a nadi is a vinadi. One sixth of a vinadi is a prana (respiration) etc., i.e. start with an astronomical phenomenon and then use arithmetic. Kishorekumar 62 (talk) 16:35, 18 September 2021 (UTC)

Removed “Time dilation”

Time dilation:

is the difference in the elapsed time as measured by two clocks. It is either due to a relative velocity between them ("kinetic" time dilation, from special relativity) or to a difference in gravitational potential between their locations (gravitational time dilation, from general relativity).

It has nothing to do with timespan of gods being very large multiple of human timespan. In Islamic theology, one day of Allah is said to be as long as 1000 human years,(some interprets it as 50000 years) This similar idea is shared by Christians.

THAT IS NOT TIME DILATION! None of it is.

ChandlerMinh (talk) 02:12, 3 April 2021 (UTC)

I can see where calling it "Time dialation" can become confusing. I do recall a story, probably in one of the Puranas, where a father and his daughter on Earth go to see Brahma to find a suitable groom for his daughter and had to wait for a performance to finish, only to find out that in the short time they were there, the suitors and many generations died on Earth. If I remember correctly, the suitable groom was chosen in a later yuga, Balarama of Dvapara Yuga. In this case it isn't just lifespans, but the experience of time by both Brahma and the humans on his loka (planet) relative to Earth. Also, refrain from using all caps and exclamation marks since it comes across as yelling. Jroberson108 (talk) 03:50, 3 April 2021 (UTC)

Still the above story doesn’t match the scientific definition of Time dilation as it is defined on Wikipedia(or anywhere else that has encyclopaedic standards). Above story may fit with the definition Time dilation shown in sci-fi movies such as Interstellar, but not with present day physics. ChandlerMinh (talk) 16:10, 3 April 2021 (UTC)

I agree. Jroberson108 (talk) 17:21, 3 April 2021 (UTC)

One yuga

Sir you say 1 yuga = 432000 but how ? One circle years 60 * 720 circle years = 43200 years but you set 432000 ? 27.7.64.204 (talk) 05:21, 11 March 2023 (UTC)

@27.7.64.204: I moved your question to a new discussion since it is unrelated to the section you added it to. Nowhere on the article page does it say 1 yuga = 432,000. What is there is a Kali-yuga = 432,000 years. When you say "circle", I assume you mean a cycle of the four yugas (catur-yuga or chatur-yuga), which lasts 4,320,000 years. I don't understand the rest of your question about 60 * 720. Can you rephrase? Jroberson108 (talk) 06:07, 11 March 2023 (UTC)