Twilight lengths at different latitudes

The easiest of all insights to understand is why twilight lengths
diminish towards equatorial latitudes,the obvious reason being that
faster surface speeds passing through the circle of illumination cause
a rapid transition from daylight to darkness at the equator and the
transition becomes longer as the speeds diminish towards the polar
latitudes.

The polar twilight around the equinox is a separate issue as its cause
arises from the orbital behavior of the Earth carrying the polar
coordinate through the circle of illumination at a vastly slower rate
and contemporaries make themselves look ridiculous by appealing to a
'Sun angle' rather than looking at twilight in its daily and separate
seasonal formats.

The nuisance Ra/Dec observers appeal to a blatantly stupid explanation
that doesn't dignify a response as it is the usual stellar circumpolar
celestial sphere and the Sun hitting the horizon at a different angle
whereas common sense determines surface rotational speeds are the
cause -

http://curious.astro.cornell.edu/que...php?number=121

So,with so many world travelers who can now move quickly from place to
place and who notice the pronounced difference in twilight lengths,it
is time to act like adults and give them a proper explanation using
the daily motion of the planet.

On Monday, October 8, 2012 9:54:58 PM UTC-7, oriel36 wrote:
The easiest of all insights to understand is why twilight lengths

diminish towards equatorial latitudes,the obvious reason being that

faster surface speeds passing through the circle of illumination cause

a rapid transition from daylight to darkness at the equator and the

transition becomes longer as the speeds diminish towards the polar

latitudes.



The polar twilight around the equinox is a separate issue as its cause

arises from the orbital behavior of the Earth carrying the polar

coordinate through the circle of illumination at a vastly slower rate

and contemporaries make themselves look ridiculous by appealing to a

'Sun angle' rather than looking at twilight in its daily and separate

seasonal formats.



The nuisance Ra/Dec observers appeal to a blatantly stupid explanation

that doesn't dignify a response as it is the usual stellar circumpolar

celestial sphere and the Sun hitting the horizon at a different angle

whereas common sense determines surface rotational speeds are the

cause -



http://curious.astro.cornell.edu/que...php?number=121



So,with so many world travelers who can now move quickly from place to

place and who notice the pronounced difference in twilight lengths,it

is time to act like adults and give them a proper explanation using

the daily motion of the planet.

It is just not that simple...

http://www.gandraxa.com/length_of_day.xml

On Oct 9, 5:26*pm, palsing wrote:
On Monday, October 8, 2012 9:54:58 PM UTC-7, oriel36 wrote:
The easiest of all insights to understand is why twilight lengths

diminish towards equatorial latitudes,the obvious reason being that

faster surface speeds passing through the circle of illumination cause

a rapid transition from daylight to darkness at the equator and the

transition becomes longer as the speeds diminish towards the polar

latitudes.

The polar twilight around the equinox is a separate issue as its cause

arises from the orbital behavior of the Earth carrying the polar

coordinate through the circle of illumination at a vastly slower rate

and contemporaries make themselves look ridiculous by appealing to a

'Sun angle' rather than looking at twilight in its daily and separate

seasonal formats.

The nuisance Ra/Dec observers appeal to a blatantly stupid explanation

that doesn't dignify a response as it is the usual stellar circumpolar

celestial sphere and the Sun hitting the horizon at a different angle

whereas common sense *determines surface rotational speeds are the

cause -

http://curious.astro.cornell.edu/que...php?number=121

So,with so many world travelers who can now move quickly from place to

place and who notice the pronounced difference in twilight lengths,it

is time to act like adults and give them a proper explanation using

the daily motion of the planet.

It is just not that simple...

http://www.gandraxa.com/length_of_day.xml

Twilight lengths are the easiest way to understand that the Earth is
round and rotating and in broad brushstrokes - latitudinal speeds
correlate with twilight lengths,the faster the surface speed the
quicker the transition from daylight to darkness as a meridian passes
through the circle of illumination.Of course it takes an astronomer to
convert one rotation in one 24 hour day into the details of 15 degrees
of rotation per hour equating to 1037.5 miles per hour at the equator
hence the shortest twilight occurs at the equator and lengthens as the
rotational speeds diminish towards the poles .

It has absolutely nothing whatsoever to do with puny Ra/Dec ideologies
of 'Sun angles' hitting the horizon .

So,here is an insight that needs processing and later investigations
will come the polar twilight where the polar coordinates act like a
beacon for the orbital behavior of the Earth and especially at the
equinoxes as those coordinates turn through the circle of illumination
in being carried through it by the orbital behavior of the Earth.

I don't expect many readers of grasping the latter insight presently
but the rotational speeds and twilight lengths as an insight is within
the comprehension of teenagers so the lack of a clear explanation
using surface speeds makes it fairly obvious that there is a lot of
welfare fraud going on out there at the expense of students and the
wider population.

Again,this is a new way to approach twilight lengths in an era of
rapid travel between latitudes where the experience is fairly
dramatic for people traveling from fairly high latitudes to equatorial
latitudes.There is no process to work this explanation into mainstream
viewing for obvious reasons so the difficulty is not technical as the
explanation is correct,the difficulty is the lack of a valid
astronomical institution that can transmit the observation - nothing
more and nothing less.

On 10/8/12 11:54 PM, oriel36 wrote:
The easiest of all insights to understand is why twilight lengths
diminish towards equatorial latitudes,the obvious reason being that
faster surface speeds passing through the circle of illumination cause
a rapid transition from daylight to darkness at the equator and the
transition becomes longer as the speeds diminish towards the polar
latitudes.


Practical Calculation for the Length of Twilight
http://www.gandraxa.com/length_of_day.xml

The sun does not appear or disappear just so, a shorter or longer twilight period begins before the start of the day and ends after the end of the day, i.e. the twilight affects the duration of the "dark" night, never the duration of the "bright" day.

For most purposes, it is sufficient to take into consideration the Civil Twilight plus the Nautical Twilight, but not the Astronomical Twilight (which latter would be interpreted as fully dark anyway for casual observers).

On Oct 8, 10:54*pm, oriel36 wrote:
The easiest of all insights to understand is why twilight lengths
diminish towards equatorial latitudes,the obvious reason being that
faster surface speeds passing through the circle of illumination cause
a rapid transition from daylight to darkness at the equator and the
transition becomes longer as the speeds diminish towards the polar
latitudes.

That is absolutely right, since the zone of twilight is clearly X
miles wide at the terminator, no matter what your latitude is, and so
twilight takes longer when that zone subtends a larger angle along a
given circle of latitude.

The polar twilight around the equinox is a separate issue as its cause
arises from the orbital behavior of the Earth carrying the polar
coordinate through the circle of illumination at a vastly slower rate
and contemporaries make themselves look ridiculous by appealing to a
'Sun angle' rather than looking at twilight in its daily and separate
seasonal formats.

But there is no contradiction between your view and looking at it on
the basis of a "sun angle". Remember, when we are *not* at the
equinox, the terminator is inclined with respect to the equator
instead of perpendicular to it, and this makes twilight take even
longer at the higher latitudes because of the angle at which the
circle of latitude cuts the terminator.

John Savard

On Tuesday, October 9, 2012 12:09:35 PM UTC-7, oriel36 wrote:
On Oct 9, 5:26*pm, palsing wrote:

On Monday, October 8, 2012 9:54:58 PM UTC-7, oriel36 wrote:

The easiest of all insights to understand is why twilight lengths



diminish towards equatorial latitudes,the obvious reason being that



faster surface speeds passing through the circle of illumination cause



a rapid transition from daylight to darkness at the equator and the



transition becomes longer as the speeds diminish towards the polar



latitudes.



The polar twilight around the equinox is a separate issue as its cause



arises from the orbital behavior of the Earth carrying the polar



coordinate through the circle of illumination at a vastly slower rate



and contemporaries make themselves look ridiculous by appealing to a



'Sun angle' rather than looking at twilight in its daily and separate



seasonal formats.



The nuisance Ra/Dec observers appeal to a blatantly stupid explanation



that doesn't dignify a response as it is the usual stellar circumpolar



celestial sphere and the Sun hitting the horizon at a different angle



whereas common sense *determines surface rotational speeds are the



cause -



http://curious.astro.cornell.edu/que...php?number=121



So,with so many world travelers who can now move quickly from place to



place and who notice the pronounced difference in twilight lengths,it



is time to act like adults and give them a proper explanation using



the daily motion of the planet.



It is just not that simple...



http://www.gandraxa.com/length_of_day.xml



Twilight lengths are the easiest way to understand that the Earth is

round and rotating and in broad brushstrokes - latitudinal speeds

correlate with twilight lengths,the faster the surface speed the

quicker the transition from daylight to darkness as a meridian passes

through the circle of illumination.Of course it takes an astronomer to

convert one rotation in one 24 hour day into the details of 15 degrees

of rotation per hour equating to 1037.5 miles per hour at the equator

hence the shortest twilight occurs at the equator and lengthens as the

rotational speeds diminish towards the poles .



It has absolutely nothing whatsoever to do with puny Ra/Dec ideologies

of 'Sun angles' hitting the horizon .



So,here is an insight that needs processing and later investigations

will come the polar twilight where the polar coordinates act like a

beacon for the orbital behavior of the Earth and especially at the

equinoxes as those coordinates turn through the circle of illumination

in being carried through it by the orbital behavior of the Earth.



I don't expect many readers of grasping the latter insight presently

but the rotational speeds and twilight lengths as an insight is within

the comprehension of teenagers so the lack of a clear explanation

using surface speeds makes it fairly obvious that there is a lot of

welfare fraud going on out there at the expense of students and the

wider population.



Again,this is a new way to approach twilight lengths in an era of

rapid travel between latitudes where the experience is fairly

dramatic for people traveling from fairly high latitudes to equatorial

latitudes.There is no process to work this explanation into mainstream

viewing for obvious reasons so the difficulty is not technical as the

explanation is correct,the difficulty is the lack of a valid

astronomical institution that can transmit the observation - nothing

more and nothing less.

You didn't read one word of my link, did you...

On Oct 10, 1:32*am, palsing wrote:
On Tuesday, October 9, 2012 12:09:35 PM UTC-7, oriel36 wrote:
On Oct 9, 5:26*pm, palsing wrote:

On Monday, October 8, 2012 9:54:58 PM UTC-7, oriel36 wrote:

The easiest of all insights to understand is why twilight lengths

diminish towards equatorial latitudes,the obvious reason being that

faster surface speeds passing through the circle of illumination cause

a rapid transition from daylight to darkness at the equator and the

transition becomes longer as the speeds diminish towards the polar

latitudes.

The polar twilight around the equinox is a separate issue as its cause

arises from the orbital behavior of the Earth carrying the polar

coordinate through the circle of illumination at a vastly slower rate

and contemporaries make themselves look ridiculous by appealing to a

'Sun angle' rather than looking at twilight in its daily and separate

seasonal formats.

The nuisance Ra/Dec observers appeal to a blatantly stupid explanation

that doesn't dignify a response as it is the usual stellar circumpolar

celestial sphere and the Sun hitting the horizon at a different angle

whereas common sense *determines surface rotational speeds are the

cause -

http://curious.astro.cornell.edu/que...php?number=121

So,with so many world travelers who can now move quickly from place to

place and who notice the pronounced difference in twilight lengths,it

is time to act like adults and give them a proper explanation using

the daily motion of the planet.

It is just not that simple...

http://www.gandraxa.com/length_of_day.xml

Twilight lengths are the easiest way to understand that the Earth is

round and rotating and in broad brushstrokes - latitudinal speeds

correlate with twilight lengths,the faster the surface speed the

quicker the transition from daylight to darkness as a meridian passes

through the circle of illumination.Of course it takes an astronomer to

convert one rotation in one 24 hour day into the details of 15 degrees

of rotation per hour equating to 1037.5 miles per hour at the equator

hence the shortest twilight occurs at the equator and lengthens as the

rotational speeds diminish towards the poles .

It has absolutely nothing whatsoever to do with puny Ra/Dec ideologies

of 'Sun angles' hitting the horizon .

So,here is an insight that needs processing and later investigations

will come the polar twilight where the polar coordinates act like a

beacon for the orbital behavior of the Earth and especially at the

equinoxes as those coordinates turn through the circle of illumination

in being carried through it by the orbital behavior of the Earth.

I don't expect *many readers of grasping the latter insight presently

but the rotational speeds and twilight lengths as an insight is within

the comprehension of teenagers so the lack of a clear explanation

using surface speeds makes it fairly obvious that there is a lot of

welfare fraud going on out there at the expense of students and the

wider population.

Again,this is a new way to approach twilight lengths in an era of

rapid *travel between latitudes where the experience is fairly

dramatic for people traveling from fairly high latitudes to equatorial

latitudes.There is no process to work this explanation into mainstream

viewing for obvious reasons so the difficulty is not technical as the

explanation is *correct,the difficulty is the lack of a valid

astronomical *institution that can transmit the observation - nothing

more and nothing less.

You didn't read one word of my link, did you...


It is quite an experience to be among people who cannot deal with
surface speeds of a round and rotating Earth as there is nothing,I
repeat,nothing difficult in assigning cause and effect where
rotational speeds correlate with twilight lengths.If people choose to
act dumb then that is there own business,I am not shouting ever
science fiction fans nor magnification guys who occupy roughly the
same interpretative level however I will point out that there is
presently no astronomical entity in existence to handle a simple
insight like this one which can then be forwarded to students as a
proof of a round and rotating planet.

There is no intellectual bottom to the vicious strain of
empiricism,after all,I discovered fairly quickly that even simple
insights such as the the rapid or gentle transition from darkness to
daylight at different latitudes with its cause are aggressively denied
when it shouldn't take more than a few moments to work through the
physical considerations.Despite the huge empirical welfare
fraud,astronomy must be accomplished one way or another .

On Tuesday, October 9, 2012 6:55:44 PM UTC-7, oriel36 wrote:

If people choose to

act dumb then that is there own business...


Are you kidding? You actually think that millions of people around the world are "choosing to act dumb", while you alone have the insight? You are delusional.

http://sphotos-b.xx.fbcdn.net/hphoto...67308407_n.jpg

On Oct 10, 4:56*am, palsing wrote:
On Tuesday, October 9, 2012 6:55:44 PM UTC-7, oriel36 wrote:
If people choose to

act dumb then that is there own business...

Are you kidding? You actually think that millions of people around the world are "choosing to act dumb", while you alone have the insight? You are delusional.

http://sphotos-b.xx.fbcdn.net/hphoto...358_4349728198...

It is a fact that latitudinal surface speeds correlate to twilight
lengths and prove that the Earth is round and rotating with a maximum
speed of 1037.5 miles per hour.

The ridiculous Ra/Dec explanation using 'Sun angle' descent is from a
community with a lack of sense of solar system scale as individual
objects or the distances between them -

http://www.universetoday.com/wp-cont...thcompared.jpg

Behind the simple explanation of twilight length using surface speeds
is the orbital twilight at the polar coordinates around the equinoxes
as they are carried around in a circle to the central Sun and why the
old perception of axial precession must be dismissed and move to a
long term orbital trait -

http://en.wikipedia.org/w/index.php?...ion.svg&page=1

Of course,people who are unable to handle daily twilight lengths and
their cause will not be capable of adjusting to the large modification
to the explanation for the seasons which introduces an additional
axis.

I told you before,the natural tendency of the empiricist is to move
technical details,even simple one like these,into personal insults
becomes a waste of time and energy and you may again get the luxury of
saying whatever you wish without a response from me .

On 09/10/2012 20:09, oriel36 wrote:
On Oct 9, 5:26 pm, palsing wrote:
On Monday, October 8, 2012 9:54:58 PM UTC-7, oriel36 wrote:
The easiest of all insights to understand is why twilight lengths

diminish towards equatorial latitudes,the obvious reason being that

faster surface speeds passing through the circle of illumination cause

a rapid transition from daylight to darkness at the equator and the

transition becomes longer as the speeds diminish towards the polar

latitudes.

The polar twilight around the equinox is a separate issue as its cause

arises from the orbital behavior of the Earth carrying the polar

coordinate through the circle of illumination at a vastly slower rate

and contemporaries make themselves look ridiculous by appealing to a

'Sun angle' rather than looking at twilight in its daily and separate

seasonal formats.

The nuisance Ra/Dec observers appeal to a blatantly stupid explanation

that doesn't dignify a response as it is the usual stellar circumpolar

celestial sphere and the Sun hitting the horizon at a different angle

whereas common sense determines surface rotational speeds are the

cause -

http://curious.astro.cornell.edu/que...php?number=121

So,with so many world travelers who can now move quickly from place to

place and who notice the pronounced difference in twilight lengths,it

is time to act like adults and give them a proper explanation using

the daily motion of the planet.

It is just not that simple...

http://www.gandraxa.com/length_of_day.xml

Twilight lengths are the easiest way to understand that the Earth is
round and rotating and in broad brushstrokes - latitudinal speeds
correlate with twilight lengths,the faster the surface speed the
quicker the transition from daylight to darkness as a meridian passes
through the circle of illumination.Of course it takes an astronomer to
convert one rotation in one 24 hour day into the details of 15 degrees
of rotation per hour equating to 1037.5 miles per hour at the equator
hence the shortest twilight occurs at the equator and lengthens as the
rotational speeds diminish towards the poles .

It has absolutely nothing whatsoever to do with puny Ra/Dec ideologies
of 'Sun angles' hitting the horizon .

So,here is an insight that needs processing and later investigations
will come the polar twilight where the polar coordinates act like a
beacon for the orbital behavior of the Earth and especially at the
equinoxes as those coordinates turn through the circle of illumination
in being carried through it by the orbital behavior of the Earth.

I don't expect many readers of grasping the latter insight presently
but the rotational speeds and twilight lengths as an insight is within
the comprehension of teenagers so the lack of a clear explanation
using surface speeds makes it fairly obvious that there is a lot of
welfare fraud going on out there at the expense of students and the
wider population.

Again,this is a new way to approach twilight lengths in an era of
rapid travel between latitudes where the experience is fairly
dramatic for people traveling from fairly high latitudes to equatorial
latitudes.There is no process to work this explanation into mainstream
viewing for obvious reasons so the difficulty is not technical as the
explanation is correct,the difficulty is the lack of a valid
astronomical institution that can transmit the observation - nothing
more and nothing less.

The length of twilight correlates even better with the altitude of the
sun at local noon transit. You are thicker than two short planks.

--
Regards,
Martin Brown