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Re: [Lynx-dev] the sun, the sun

From: David Woolley
Subject: Re: [Lynx-dev] the sun, the sun
Date: Sun, 9 Aug 2020 11:32:22 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.11.0

On 08/08/2020 23:29, Halaasz Saandor via Lynx-dev wrote:
I suspect that it is time to detach the physical second, that physicists use, from the second that is one 86400th of a day, and find a definition of "day" that depends on our experience of sunlight. The last definition that I found makes a day 86400 seconds.

I can't find the original for this thread, but days are not 86400 seconds, which are currently defined in terms of a quantum transition frequency. The actual length of a day is less stable than this. Leap seconds are introduced into UTC to correct for this.

(Also, a solar day is not constant throughout the year, because the earth's orbit round the sun is elliptical.)

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