Julian Date format -- interval not dateTime (my thought)

[Scott Chapal]

Was there ever any determination about Julian Day?

What are we calling Julian Day in EML any way?  

YYYYddd or ddd ??

David's numbers are what?  dddYYYY?

Or does this advice pertain?  "The system of Julian days should not be
confused with the simpler system of the same name which associates a
date with the number of days elapsed since January 1st of the same
year (according to which 2000-12-31 is day 366 of the year 2000)."

Because the 'real' Julian Day is used in astronomy to number
chronological days...

So,

ddd     - RATIO
YYYYddd - ORDINAL

Or just other dateTime formats??

-Scott

David Blankman <dblankman at lternet.edu> writes:

> Don,
> 
> I am not sure what the correct representation of Julian dates would
> be. My sense is that the Julian date scale is actually an INTERVAL
> scale not a dateTIME scale; arithmetic calculations are consistent,
> that is, 2451919 - 2451819 gives the same value as 2351919 - 2351819.
> It probably also makes sense to say that something that takes 200
> julian days  = 2 * 100 julian days. My first thought was that it was a
> ratio scale, but it is more like the celcius scale than the kelvin
> scale in that the 0 on the julian scale is an arbitrary one.
> 
> 
> The julian date scale does not suffer from the problems that are
> associated with a standard calendar scale, that is, the only unit is
> the day and the fraction of a day; there is nothing like Feb 20 - Jan
> 20 representing a different number of days than Aug 20 - July 20.

> I would appreciate enl-dev feedback on that.
> 
> David
> 
> Henshaw, Don wrote:

> >  On another topic:
> 
> > Can a julian date be represented in the format string for
> > measurementScale of datetime
> 
> > i.e., YYYYddd
> >  Other notes (being rather picky): pertaining to
> > eml-unitDictionary.xml (2.0.0)

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