Brent,
The "small circle" route is the one that takes you on a curved path, always
toward due east.
You could also start out going due east on a "great circle" route, and in
that case, as you note, the path would gradually veer southward.
Both of these routes start out perpendicularly from the north-south line.
Roger
From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of David Patte
?
Sent: Tuesday, September 15, 2015 12:34 PM
To: sundial@uni-koeln.de
Subject: Re: due east
They are east-west lines, but they are not straight. They are circles.
On 2015-09-15 12:30, Brent wrote:
If I was in halifax at sunrise on the equinox and the earth stopped rotating
and I walked due east (towards the sun) across the ocean
I would end up in Southern Spain and not on my same latitude which is in
Southern France.
So I conclude that latitude lines are not east-west lines.
Correct?
thanks;
brent
On 9/15/2015 9:01 AM, Frank Evans wrote:
Hi Brent and all,
Compass directions that are pursued make spiral curves towards the poles, if
north of east-west then towards the north pole, if south of east-west then
towards the south pole. If east or west then they do neither but continue
east-west. Try Googling "loxodromic curve". It's what you draw on a chart.
Sailors call it a "rhumb line".
Frank 55N 1W
On 15/09/2015 15:10, Brent wrote:
I'm confused maybe.
I live in the northern hemishpere and anticipating the equinox on the 23rd.
Supposedly the sun will rise due east.
So if due east is a right angle from north south and I traveled due east I
would not follow my line of latitude.
I would get further and further south of my latitude the further I traveled.
So either the lines of latitude are not east west lines or due east is not a
straight line but curved.
I suspect lines of latitude are not east west lines?
They would work fine if the earth was not tilted, but it is.
Wouldn't it make sense to coordinate the globe so lines of latitude (or call
them something else) are straight and a right angle
from north south?
brent
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