-> In my search for DST, I read somewhere that it had more to do with 
-> tempurature than it did with daylight. For instance, the daylight hours in 
-> Europe are the same in length in October as they are in February. 
  
I guess that's true everywhere in the world. ;> 
  
I read someplace that DST is designed to make the *morning* rush-hour 
lighter. Huge numbers of people drive to work in a state of 
semi-consciousness, but they've usually woken up by the time they have 
to drive home. So the idea is to give the morning zombies as much light 
as possible. 
  
The time of sunrise in October is *not* the same as it is in February. 
There's an effect called the "equation of time" which makes everything 
to do with the sun - sunrise, sunset, etc. - happen earlier in 
October-November than it does in February-March. So the morning 
rush-hour is generally gloomier in February than in October, or at 
least it would be if the clocks did not change. This means that it's 
tolerable to keep the clocks "ahead", so activities such as the rush 
hour happen earlier, closer to the solstice in November than it is in 
February. That's why the dates on which the clocks change are not 
symmetrical about the solstice. According to the new rules, the clocks 
will "spring ahead" about eleven weeks after the December solstice, but 
will "fall back" only about six weeks before the solstice. 
  
Theoretically, the ideal dates for the changes would depend on the 
latitude, but that would make things far too complicated. 
  
                        dow 
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