Time zone confusion and implementation hints

David Patte dpatte at relativedata.com
Wed Jul 7 13:41:19 UTC 2010

Yes, delta-T is very important in all astronomical calculations

Clive D.W. Feather wrote:
> David Patte said:
>> Though its true that no one was wondering about daylight saving and zone 
>> offsets 10000 years ago, the dates we compute for 10000 years ago, give 
>> users a 'feel' for the time of an event that happened that long ago. 
>> Most people don't know the difference between apparent time and mean 
>> time, but saying that an event likely happend near 6PM EST June 1st 
>> 8000BC is something that most people can relate to.
> Except that, that far back, leap seconds probably make a significant
> difference as well.
> That far back, the required correction (i.e. TAI - UT1) is about 86 hours
> (that is, 3.5 days).

More information about the tz mailing list