In message <[EMAIL PROTECTED]>, "Bill Hawkins" writes: >Well, yes. The Earth expands from the heat, rotation slows, [...]
You're right, but from my back of the envelope calculation, it's negligble. Most of the expected expansion is the water in the oceans, which expand roughly 10^-4 per Kelvin in the relvante temperature range. When you factor in that the average dept of the oceans is close to 4000m, but not all of it is expected to warm up in our lifetime, so you get that 1K increased temperature is roughly 0.1 meter sea level increase. That means that the radius of the earth increases by about 15 parts per billion. But since the density of water is much lower than the rest of the planet, and that the water amounts to less than a twothousandth of the radius, the increase in angular momentum is only in the 10^-12 range. 10^-12 of a year is 31.5 microseconds, which would be added to the UTC-UT1 difference. Measurable, but not a problem compared what else one Kelvin would cause of trouble. Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [EMAIL PROTECTED] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
