Re: which side of the moon recieves more light over a year?
- From: "oriel36" <geraldkelleher@xxxxxxxxx>
- Date: 28 Aug 2006 03:28:36 -0700
Taylor blanchard wrote:
This question may seem simple or obvious but please read all of it.
Which side of the moon receives more light, the near side or the far
side (sometimes called the dark side)?
Two factors must be considered:
1) The direct sunlight is never interupted (during the lunar day) on the
far side but is eclipsed by the earth once or twice a year on the near
side. Therefore, the far side of the moon actually receives a few MORE
hours of direct sunlight per year.
2) Earthlight falls almost constantly (in varying amounts as the earth
goes through it's phases) onto the nearside in the same way that
moonlight falls onto earth but earthlight never falls onto the far side.
Therefore the far side receives LESS (none at all) sunlight reflected
off the earth.
There is no such thing as 'Earth phases' there is such a thing as a
change in orbital orientation of the Earth and it is about time men
started to work with it.
The replies you received so far are from 17th century celestial sphere
geometers,they do not recognise the change in orbital orientation due
to their idiosyncratic system which qualifies the return of a star in
23 hours 56 min 04 sec as a means tio reflect the Earth's axial and
orbital motion.
http://www.pfm.howard.edu/astronomy/Chaisson/AT401/IMAGES/AACHCIR0.JPG
These Newtonian geometers force a system where a terrestial meridian
returns to the Sun in 24 hours exactly therby keeping the orbital
orientation fixed over the course of an annual orbit.
Discerning a change in orbital orientation is problematic insiofar as
axial orientation and rotation runs almost parallel however the planet
Uranus,with its pronounced axial orientation relative to orbital
orientation provides an adequate description of what occurs to the
Earth -
http://www.nordita.dk/~steen/fysik51/ast/ast134_files/AT41303_files/AACHCVO0.JPG
In short,drop this silly 'phases' and recognise the importance of
orbital orientation for a change,then and only then consider the what
to do next.
So, over the course of say a year, and ignoring for the moment the fact
that the earth blocks out some starlight falling onto the nearside of
the moon, which side actually receives more light?
N. Taylor Blanchard
<www.ntaylorblanchard.com>
.
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