[microsound] 1.61803399
Andrew Salch
asalch at math.jhu.edu
Fri Mar 12 16:40:51 EST 2010
The length of the year is the period of revolution of the Earth about the
Sun. You could use the geometry of the Earth's orbit to come up with some
clever reason for "phi day" to fall on a particular day of the year; that
seems more satisfying (at least to me) than choosing a day based on the
decimal expansion of phi, or some other non-geometric means.
For example, at any moment, there is a unique rectangle that can be
inscribed in the plane of the Earth's orbit such that two of the
rectangle's sides are given by the major axis and the minor axis of the
Earth's elliptical orbit about the Sun, with one corner of the rectangle
given by the Sun, and the opposite corner of the rectangle given by the
Earth. There are eight moments in each year at which that rectangle is of
the correct proportions to form a golden rectangle. Perhaps someone wants
to calculate on what dates those eight moments of the year fall. Or you
could use the geometry of the solar system (on which our whole calendar is
based) in other clever ways to pick out certain days of the year in which
some proportion of distances between objects in the solar system is equal
to phi.
On Fri, 12 Mar 2010, David Powers wrote:
> Interesting... so in the Northern Hemisphere it falls on Halloween,
> which might add a new twist to the interpretation of Phi...
>
> Having a different date for Northern and Southern hemisphere is
> problematic for a global event though. The proposed date for the
> Northern Hemisphere, May 6th though, would be a practical choice if we
> want to start the project now, because it is both in the near future
> but distant enough that people have a reasonable amount of time to
> create something.
>
> ~David
>
>
> On Fri, Mar 12, 2010 at 2:12 PM, Kim Cascone <kim at anechoicmedia.com> wrote:
>> here's another take on the idea of Phi Day:
>>
>> http://www.goldenratio.org/phi_day.html
>>
>>
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