On 02/02/2011 05:28, Stephen Colebourne wrote:
On 2 February 2011 12:20, Tony Finch<[email protected]> wrote:
On Wed, 2 Feb 2011, Stephen Colebourne wrote:
- the solar-day is a commonly used unit of measurement
Is it? I would agree that some kind of day is a commonly used unit of
measurment, but I am not sure it's the solar day.
Great :-) A disagreement yields insight. So what statement similar in
style is agreed?
- a day is a commonly used unit of measurement
- a day is informally defined in line with the rising and setting of the Sun
- a solar-day is...
The problem is that many of these definitions are approximately
correct. A day can mean anything from sunrise to sunrise, to exactly 24
hours to the more informal 'until close of business today or tomorrow'
If I have 180 days to pay a loan, I have to pay it by a certain time,
UTC, on the 180th day or I'm in default. In this definition, the earth
enters into it only to the extent that UTC varies from 86400s days
during that interval. This might mean that it will be a little more or
a little less than 180 solar days.
Warner
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