JavaScript for Equinox date/times?

Does anyone here have or know of JavaScript for calculating the UTC
dates and times of Vernal Equinoxes?

FYI, news from South Africa is that their satellite
will soon be launched from a submarine at Baikonur.

--
(c) John Stockton, nr London, UK. Turnpike v6.05 MIME.
Web URL:http://www.merlyn.demon.co.uk/ - FAQqish topics, acronyms & links;
Astro stuff via astron-1.htm, gravity0.htm ; quotings.htm, pascal.htm, etc.
No Encoding. Quotes before replies. Snip well. Write clearly. Don't Mail News.