Lights
 

Hah! If the earth was not curved height would not be the primary
determinant of geographic range. You've still ignored the question of
color which has a very large effect.

Cheers

Bart Senior wrote:
You didn't account at all for the curvature of the earth.

Yes, I do prefer more complete answers. The idea here
is to pass on information to other readers. Details count.

Nav wrote

It is remarkable that you prefer a long winded yet incomplete answer to
that which gives _all_ the factors without being longwinded. Was may
answer not precise enough?

Bart Senior wrote:

Same for you. Need a little more detail to get a point for the one
question listed below.


DSK wrote:

Bart Senior wrote:


1 pt each
What are the factors that determine a single light's visible range?

The height and the brightness


To be more precise, the height determines the geographic range while
visible range is limited by conditions as well as luminosity and colour.

Cheers (call me Nav)

Lights
 

Nav wrote:

Hah! If the earth was not curved height would not be the primary
determinant of geographic range. You've still ignored the question of
color which has a very large effect.

You are free to explain at length, if you wish. Or, if you don't like it
here, you're free to go away. Your call.

DSK

Lights
 

Michael wrote:
For additional information. The first thing you see on a very clear night,
when the clouds are reflective overhead of the light source, and/or when the
distant light is very strong, is 'light loom.'

I mentioned that. Good post though. I wonder why Navvie hasn't
complained that you also failed to explain how color affects visible
range? He must like you more!

DSK

Lights
 

On Tue, 06 Jul 2004 12:56:04 -0400, DSK wrote:

Nav wrote:

Hah! If the earth was not curved height would not be the primary
determinant of geographic range. You've still ignored the question of
color which has a very large effect.

You are free to explain at length, if you wish. Or, if you don't like it
here, you're free to go away. Your call.

You are all failing to take into account the effect of doppler shift
and how it affects color. As you sail towards a light source, the
wavelength will be shorter, and as you sail away, longer.

I'm sure this is a serious problem, worthy of an extended thread all
its own.

Lights
 

That is a fast boat you have. Must be a Catamarran.

A. Diesel Vents wrote

On Tue, 06 Jul 2004 12:56:04 -0400, DSK wrote:

You are all failing to take into account the effect of doppler shift
and how it affects color. As you sail towards a light source, the
wavelength will be shorter, and as you sail away, longer.

Lights
 

DSK wrote:

Nav wrote:

Hah! If the earth was not curved height would not be the primary
determinant of geographic range. You've still ignored the question of
color which has a very large effect.


You are free to explain at length, if you wish. Or, if you don't like it
here, you're free to go away. Your call.


You didn't know that for equal luminosity that red lights are less
visible than green?

Chees

Lights
 

DSK wrote:

Michael wrote:

For additional information. The first thing you see on a very clear
night,
when the clouds are reflective overhead of the light source, and/or
when the
distant light is very strong, is 'light loom.'


I mentioned that. Good post though. I wonder why Navvie hasn't
complained that you also failed to explain how color affects visible
range? He must like you more!



Color also affects loom strongly but few pople know that -even ocean
yachtmaster instructors!

Cheers

Lights
 

A. Diesel Vents wrote:

On Tue, 06 Jul 2004 12:56:04 -0400, DSK wrote:


Nav wrote:


Hah! If the earth was not curved height would not be the primary
determinant of geographic range. You've still ignored the question of
color which has a very large effect.

You are free to explain at length, if you wish. Or, if you don't like it
here, you're free to go away. Your call.


You are all failing to take into account the effect of doppler shift
and how it affects color. As you sail towards a light source, the
wavelength will be shorter, and as you sail away, longer.

I'm sure this is a serious problem, worthy of an extended thread all
its own.

Especially as you tack out of the solar system with your light sail!

Cheers

Lights
 

Well, it's all relative.

--
"j" ganz @@
www.sailnow.com

"Bart Senior" wrote in message
et...
That is a fast boat you have. Must be a Catamarran.

A. Diesel Vents wrote

On Tue, 06 Jul 2004 12:56:04 -0400, DSK wrote:

You are all failing to take into account the effect of doppler shift
and how it affects color. As you sail towards a light source, the
wavelength will be shorter, and as you sail away, longer.