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je pourai savoir qui peut m'aider ?

Qu'est que ce que vous voulez alors? —Stephen 12:34, 1 March 2006 (UTC)

March 21st[edit]

I accept that some sources and cultures regard March 21st as the "First Day of Spring", but this date is not even the vernal equinox in current years, and from an astronomical viewpoint (without the temperature lag), the equinox should be the middle of spring. Does anyone know where the misconception of the equinox being the start of spring arose? It has long standing - does it date back to the old Julian calendar when the seasons were shifted? Dbfirs 12:06, 13 April 2009 (UTC)

It may seem superficially logical that the equinox and solstice should mark the center point of the temperature curve, but that is not what happens. The first three weeks of September in the U.S. are a very warm period (in southern states, very hot), and the season changes noticeably cooler within just a few days of Sept. 21. The first three weeks are summer weather, the last week is fall weather. Air conditioning bills in southern zones are very high for September, but almost stop in October. In any case, in the U.S., the seasons are as fixed as the days of the week and the national holidays. In the winter, freezing weather runs right up to the equinox in most areas. The equinoxes are close to the beginning of sharp temperature curves, not in the middle of the curves. —Stephen 13:08, 13 April 2009 (UTC)
Yes, I was surprised to find (after I'd made the edits), that these dates seem to have some sort of official status. In my part of the world, where a hard frost on September 1st turned all my hydrangea leaves and flowers a surreal black, the date seems ridiculous. Perhaps it would be wiser to avoid committing the Wikipedia entry to fixed dates. The temperature lag might be more than seven weeks in parts of the USA, but it is definitely shorter in other parts of the world, especially oceanic Europe and the southern hemisphere. Do Americans really regard summer as beginning on June 21st? In recent years, that has been near to the end of the sunny weather here! Dbfirs 19:44, 13 April 2009 (UTC)
I think it would be a better idea to mark the definition as U.S. and add a new definition for UK. Obviously Australian and NZ will be different again, and since Canada is so far north, it might not be the same as the U.S. I always thought the U.S. dates appied to the entire free world north of the equator. Yes, in the U.S. summer invariably begins at the moment of the summer solstice, winter at the winter solstice, and spring and fall at the equinoxes. The U.S. can be divided into eleven temperature zones[1] most of the zones in the east, south and west, trees begin to put out new buds very close to the vernal equinox. Statistically speaking, the coldest part of winter is the first week of February. If the equinox were in the center, spring would begin in the dead of winter. As it happens, the beginning of February is midway through our winter season. Here in zone 7, temperatures begin to hit 100°F soon after June 21st, and they continue to be that high until almost exactly Sept. 21. —Stephen 07:43, 15 April 2009 (UTC)
It's not exclusive to the US. The date of March 21st (not the current equinox) seems to be fixed in more cultures than I had realised. I must have some Celtic blood in my veins because I've always thought of the equinox as mid-season, with the temperature lag being an anomaly. What do you make of the American meteorologists' saying that spring starts in the Everglades in early February and moves north at around twenty miles per day? Dbfirs 08:30, 15 April 2009 (UTC)
By that they just mean springlike temperatures. The season itself officially begins at the same moment everywhere in the country, from Florida to Alaska. The same statement holds true in the fall when speaking of the color-change in the tree leaves from green to bright reds and yellows. The color change moves from north to south at the rate of about 20 miles a day. —Stephen 10:17, 15 April 2009 (UTC)
Who decrees the start date of this "official spring"? Dbfirs 16:54, 15 April 2009 (UTC)
Could be it’s the same authority as the one who decided a week has seven days. But if it wasn’t King George, then I suppose it was the founding fathers. I had thought the answer might be found on Wikipedia, but the definitions there have been rewritten for Great Britain and no longer pertain to the situation in America. As far as I know, our dates were established in the 16th century, or may have been brought over from the Old World along with the English language. —Stephen 17:11, 15 April 2009 (UTC)
You may well be right about the dates being brought over by the founding fathers, that is why I thought they might relate to the old Julian calendar when the seasons were shifted. I tried to adjust the Wikipedia articles from a global viewpoint because articles in English are read worldwide. They were previously very much a United States view. What I am trying to find out is the question of who decided that the equinox & solstice dates should be the start of the seasons. Was it a misunderstanding of the astronomical position because of an approximate coincidence of temperature lag with these dates? I thought that meteorologists world-wide (even in the USA) usually reject the idea of a fixed date for seasons, but I'll do a bit more research when I have time. Dbfirs 07:01, 16 April 2009 (UTC)


The translation of Spring (season) in Basque is Udaberri, not Udaherri...Somebody could change it? I can't!

You did. Well done! Anyone can edit, and constructive edits are always appreciated. Thank you. Dbfirs 18:05, 2 July 2009 (UTC)