Another China time zone question
Jonathan.Hassid at uts.edu.au
Mon Oct 18 23:39:06 UTC 2010
Being a political scientist, I can't claim to know the difference between mean and apparent solar time, but one of the relevant portions in the article says:
"... so the greatest probability is that the 'Beijing Time' they were then using [ie before 1954] is not Beijing mean time (北京地方平时) but actual Beijing solar time (北京地方的真太阳时)" (p3).
On Oct 18, 2010, at 9:30 PM, Tony Finch wrote:
> On Sat, 16 Oct 2010, Jonathan Hassid wrote:
>> There is a longish discussion about whether Beijing time means local
>> solar time or based on a GMT offset, and Guo argues that between 27 Sep
>> 1949 and 1954 (date unspecified), "Beijing time" meant local Beijing
>> solar time (with an offset varying by time of year of course, but
>> generally between 46 and 56 minutes earlier than 120 degree latitude
> That's surprising. It's easier to generate time signals based on mean
> solar time, not aparrent solar time.
> f.anthony.n.finch <dot at dotat.at> http://dotat.at/
> HUMBER THAMES DOVER WIGHT PORTLAND: NORTH BACKING WEST OR NORTHWEST, 5 TO 7,
> DECREASING 4 OR 5, OCCASIONALLY 6 LATER IN HUMBER AND THAMES. MODERATE OR
> ROUGH. RAIN THEN FAIR. GOOD.
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