PDA

View Full Version : Boffin says Astronomical Unit should be binned



TDL 76
2008-Feb-07, 12:43 PM
http://www.theregister.co.uk/2008/02/07/astronomical_unit_inaccurate_shrinking_sun/

01101001
2008-Feb-07, 05:20 PM
See topic NewScientist :'Astronomical unit' may need to be redefined (http://www.bautforum.com/astronomy/70042-newscientist-astronomical-unit-may-need-redefined.html).

neilzero
2008-Feb-24, 11:35 PM
Most other science and engineering has gone metric so it would be reasonable to bin both the astronomical unit and the parsec. We could redefine the light year to exactly ten trillion kilometers. Neil

JustAFriend
2008-Feb-25, 01:26 AM
An AU is a measurement of convenience.

A more accurate measurement grounded in real-world terms would be light-seconds or light-minutes or light-hours, etc.

But who cares??? It's just a way to tell someone "Its this far away..."

clint
2008-Feb-26, 04:12 AM
I think AU is great for illustrating astronomical distances in easily understandable terms,
especially when talking about solar systems.

It wouldn't really help me to know that exoplanet XY was, say, 10.000.000 km away from its star.
Or 6,5 lightminutes ;)

NHR+
2008-Feb-26, 05:51 PM
We could redefine the light year to exactly ten trillion kilometers.

Not without redefining the length of either a kilometer or a year (or both), we couln't. Which one did you have in mind?