Talk:Time standard

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This article contains substantial amounts of text from http://tycho.usno.navy.mil/systime.html by Dr. Demetrios Matsakis, Director, Time Service Dept., [email protected])

As the work of an employee of a U.S. Federal Government Agency employee for that agency, without any other copyright notice that I can find, this should be in the public domain.

Also from this USNO article on the definition of seconds and leap seconds, which is also in the public domain by the same reasoning. The Anome

I looked at these but I've rewritten the article substantially so it doesn't have much overlap anymore. Added as sources. Mathnerd314159 (talk) 20:37, 29 January 2023 (UTC)Reply

Added geoid link, and explanation why JD day starts at noon. -- Martin Vermeer — Preceding unsigned comment added by 130.233.136.69 (talk • contribs) 08:27, 7 February 2003 (UTC)Reply

What are the dynamical time scale and coordinate time? Paranoid 20:54, 18 Dec 2004 (UTC)

I think these are addressed well by their pages. Mathnerd314159 (talk) 20:37, 29 January 2023 (UTC)Reply

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The following content was removed from page Time with this edit on 24 March 2022 at 05:16.

Maybe some of it could be inserted in this article.

ZandDev (msg) 16:19, 14 July 2023 (UTC)Reply

I already merged it in this edit, that was what I did first. Mathnerd314159 (talk) 18:23, 14 July 2023 (UTC)Reply

@Mathnerd314159: Oh yes now I realized that the major part of the text was merged. I was just trying to figure out how to fix the broken redirect to section World time and I didn't find (with Search:) the corresponding paragraph anywhere. There are a lot of broken and forsaken redirects to section in redirect pages, article bodies and in other wikis... ;) ZandDev (msg) 19:25, 14 July 2023 (UTC)Reply

@ZandDev Yeah I was looking more at that redirect World time and I think Universal Time might actually be a more correct target. "World time" is kind of this old phrase from when they weren't synchronized and people were proposing different synchronized times like "universal time", "cosmic time", etc. And what ended up being standardized was Universal Time, as discussed in Universal Time#History. There is a book which directly defines "World Time" as UTC but I think it's more correct to link to UT, as UTC came later, and also it's kind of a children's book which oversimplifies the story anyway.

But there's also a substantial amount of "world time zone map" results in Google, and honestly I think most people will be looking for the different times in the world with that sort of query. So I set it to Time zone#Worldwide time zones with a hatnote for UT. They both seem like good targets, up to you if you want to change it. I also checked the original section of Time#World time back in 2012 and the statements that seem relevant are:

• "The basis for scientific time is a continuous count of seconds based on atomic clocks around the world, known as the International Atomic Time (TAI)."
• "UTC [has leap seconds added to keep] clock time synchronized with the rotation of the Earth."
• "The Global Positioning System also broadcasts a very precise time signal worldwide,"
• "Earth is split up into a number of time zones."

Nothing really worth rescuing as content. They do mention the time-zones and the UTC so I think both are worthwhile. GPS I don't think is really relevant. Mathnerd314159 (talk) 20:42, 14 July 2023 (UTC)Reply

@Mathnerd314159: Your choice explanation is clear. I agree with it. I'm not going to change the redirect.

However before I was searching the Time $ UTC (former named World time) short paragraph removed in the merge edit. ZandDev (msg) 23:03, 14 July 2023 (UTC)Reply