"Jack Harrison" wrote in message
...

"Col" wrote

From this distance to the horizon calculator:

http://www.boatsafe.com/tools/horizon.htm

I love that website. It gives the answer to 15 decimal places. (that's to
an accuracy of micro metres). Wow!

Is that measuring to the front of the eye or to the back? (or to the front
of the cornea or to the back?)

Why do people persist in trying to impress Joe Publish with perceived levels
of accuracy that just aren't possible?

I don't think they are trying to 'impress' people.
Far more likely is that whatever software they use to calculate the
distances by default churns out such figures and they haven't seen
fit to correct it into something more reasonable.

Col
--
Bolton, Lancashire.
160m asl.
http://www.reddwarfer.btinternet.co.uk
http://www.reddwarfer.btinternet.co....rPictures.html

"Jack Harrison" wrote in message
...

"Col" wrote

From this distance to the horizon calculator:

http://www.boatsafe.com/tools/horizon.htm

I love that website. It gives the answer to 15 decimal places. (that's to
an accuracy of micro metres). Wow!

Is that measuring to the front of the eye or to the back? (or to the front
of the cornea or to the back?)

Why do people persist in trying to impress Joe Publish with perceived levels
of accuracy that just aren't possible?

I don't think they are trying to 'impress' people.
Far more likely is that whatever software they use to calculate the
distances by default churns out such figures and they haven't seen
fit to correct it into something more reasonable.

Col
--
Bolton, Lancashire.
160m asl.
http://www.reddwarfer.btinternet.co.uk
http://www.reddwarfer.btinternet.co....rPictures.html

"Rodney Blackall" wrote in message
...
In article , Joe Hunt
wrote:

wrote in message
oups.com...
Further to the question about the CB cloud over Kent which could be
seen from near Heathrow, what's the furthest that CBs at our
latitudes can be seen?

[Snip]

Summer is the time when you see CBs at a greater distance due to their
larger height. Some CBs can touch 40,000ft in the height of summer in
air masses with high tropopauses. Conversely, in winter, CB tops in a
northerly can be as low as 8000ft. Think of Pythagoras' Theorem.

I remember this subject coming up before, I'd try Google Groups.

DONT think Pythagoras! The Earth is not flat.
Set cloud tops at anything up to 50,000 for Summer, anvils will be lower.


Surely when talking of relatively short distances, the effects of the
Earth's curvature are minimal ?

Joe

"Rodney Blackall" wrote in message
...
In article , Joe Hunt
wrote:

wrote in message
oups.com...
Further to the question about the CB cloud over Kent which could be
seen from near Heathrow, what's the furthest that CBs at our
latitudes can be seen?

[Snip]

Summer is the time when you see CBs at a greater distance due to their
larger height. Some CBs can touch 40,000ft in the height of summer in
air masses with high tropopauses. Conversely, in winter, CB tops in a
northerly can be as low as 8000ft. Think of Pythagoras' Theorem.

I remember this subject coming up before, I'd try Google Groups.

DONT think Pythagoras! The Earth is not flat.
Set cloud tops at anything up to 50,000 for Summer, anvils will be lower.


Surely when talking of relatively short distances, the effects of the
Earth's curvature are minimal ?

Joe

"Rodney Blackall" wrote in message
...
In article , Joe Hunt
wrote:

wrote in message
oups.com...
Further to the question about the CB cloud over Kent which could be
seen from near Heathrow, what's the furthest that CBs at our
latitudes can be seen?

[Snip]

Summer is the time when you see CBs at a greater distance due to their
larger height. Some CBs can touch 40,000ft in the height of summer in
air masses with high tropopauses. Conversely, in winter, CB tops in a
northerly can be as low as 8000ft. Think of Pythagoras' Theorem.

I remember this subject coming up before, I'd try Google Groups.

DONT think Pythagoras! The Earth is not flat.
Set cloud tops at anything up to 50,000 for Summer, anvils will be lower.


Surely when talking of relatively short distances, the effects of the
Earth's curvature are minimal ?

Joe

In article ,
Joe Hunt writes:
Surely when talking of relatively short distances, the effects of the
Earth's curvature are minimal ?

But if the Earth was flat, you'd be able to see cloud tops at an
unlimited distance away. So in this instance, the effect of the
curvature is highly significant.
--
John Hall "[It was] so steep that at intervals the street broke into steps,
like a person breaking into giggles or hiccups, and then resumed
its sober climb, until it had another fit of steps."
Ursula K Le Guin "The Beginning Place"

In article ,
Joe Hunt writes:
Surely when talking of relatively short distances, the effects of the
Earth's curvature are minimal ?

But if the Earth was flat, you'd be able to see cloud tops at an
unlimited distance away. So in this instance, the effect of the
curvature is highly significant.
--
John Hall "[It was] so steep that at intervals the street broke into steps,
like a person breaking into giggles or hiccups, and then resumed
its sober climb, until it had another fit of steps."
Ursula K Le Guin "The Beginning Place"

In article ,
Joe Hunt writes:
Surely when talking of relatively short distances, the effects of the
Earth's curvature are minimal ?

But if the Earth was flat, you'd be able to see cloud tops at an
unlimited distance away. So in this instance, the effect of the
curvature is highly significant.
--
John Hall "[It was] so steep that at intervals the street broke into steps,
like a person breaking into giggles or hiccups, and then resumed
its sober climb, until it had another fit of steps."
Ursula K Le Guin "The Beginning Place"

"Joe Hunt" wrote in message
...


Surely when talking of relatively short distances, the effects of the
Earth's curvature are minimal ?

Joe

Joe

"On a clear day you can see for ever"

Do you really think so? The Earth is NOT flat. Work it out.

Regards, Roger

"Joe Hunt" wrote in message
...


Surely when talking of relatively short distances, the effects of the
Earth's curvature are minimal ?

Joe

Joe

"On a clear day you can see for ever"

Do you really think so? The Earth is NOT flat. Work it out.

Regards, Roger