Re: Planets and Stars - an idea


"Wayne Throop" <throopw@xxxxxxxxx> wrote in message news:1242025937@xxxxxxxxxxxx
: "Terence Nesbit" <TerryKidd@xxxxxxx>
: I have been looking at Dish Earth often lately,

Too bad you don't comprehend what you see.
As demonstrated by your confusing a day/night cycle effect
with a seasonal cycle effect, which you proudly announced elsethread.

: Although perhaps some people do not think that the sun shines equally
: on both sides of where it does shine on the planet (left/right of a
: middle point), that is the only way 16+ hours of sunlight or greater
: could be depicted.

The sun shins on exactly half the planet, all the time.
This is required by the simple fact that the earth is a sphere
(more or less), and the sun is far, far away and can be treated
as a point source at a great distance, to a first approximation.

And this is completely and utterly compatible with a 16 hour
day, and it's easy to depict. Trivially easy.


Wayne Throop throopw@xxxxxxxxx http://sheol.org/throopw

Not even this makes sense to you, does it?

A 12 hour day along a given latitude requires 12 hours of daylight along that latitude. A 16 hour day requires 16 hours of daylight along that latitude. Whether the Sun actually shines for that long does not matter. But at no point can a 16 hour period be depicted by seeing only one half of the sphere unless it is balanced by an equal distance on the unseen half of the planet. That half will show just as much sunlight as the visible half does were that side looked at instead.

This is all that I was saying, and it has not been depicted properly. Viewed from one side, where both shadow and sunlight can be seen, it appears to look like that Earth is 2/3 to 3/4 covered in Sunlight.

Terence

.

Relevant Pages

  • Re: Planets and Stars - an idea
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    (rec.arts.sf.science)
  • Re: False astronomical correlation
    ... sunlight exactly half the time over the course of a year. ... If we assume that all of the Earth is completely cloud free at all ... The South Pole is in sunlight 182 days per year, ... the Sun appear to be almost 9 arc seconds lower in the sky. ...
    (sci.astro.amateur)
  • Re: False astronomical correlation
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    (sci.astro.amateur)
  • Re: which side of the moon recieves more light over a year?
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