Message

For those fine grain calculations of distances
that "aletheiak" has shown that simple calculations
work just fine for short distances,
it's worthwhile thoroughly studying

Sigurd Humerfelt's web site notes on

"The Earth According to WGS 84"

   Every degree of Latitude

<http://home.online.no/~sigurdhu/Grid_1deg.htm>

   Every 10 minutes of Latitude

<http://home.online.no/~sigurdhu/Grid_10min.htm>

   How WGS 84 defines the Earth

<http://home.online.no/~sigurdhu/WGS84_Eng.html>

Different degree formats: Resolutions and conversions

http://home.online.no/~sigurdhu/Deg_formats.htm

=========================

TRIVIA QUESTION:

What is the
Latitude halfway between the Equator

and the North or South Geographic Poles?

[ NOT WHAT YOU THINK!! (Not what I thought!)]

Lat. Half Distance = N/S 45.14432° = N/S 45° 08.659′= N/S 45° 08′39.5"

where (1 min. of lat. = 1852.243 m) & (1 min. of long. = 1310.811 m)

If the Earth had been a perfect sphere,
this would had happened at exactly N/S 45° of latitude
( ½ × 90° = 45° ).

I have added the 1º web address to BP.

The rest can be reached from there.

I typed it as "World..." instead of "Earth..."

and "it" is not letting me correct it.

It goes through the motions of letting me

edit ... and then ... it switches back to "World." ??

Maybe it's just slow. ??

There will be a quiz.

BTW, I got tired of copying the gcb results

for distances, etc. from the screen and added

a "save output to file" option.

The new version is on my web site.

For anyone not wanting/needing the results

for all six algorithms as in gcb,

I have a Sodano-only, Lat/Long-only

(no ham radio grid) version of gcb

that I can send.

In addition, one can switch between WGS84,

NAD83, NAD27 and other major datums (as in GCGC).

The datums are fixed for each algorithm

in gcb. I will probably upload "Sodano"

when I get back home Monday.

Cheers,

Ron McC.
w2iol@...

Ronald C. McConnell, PhD

WGS-84: N 40º 46' 57.6" +/-0.1" W 74º 41' 22.1" +/-0.1"

NAD-27: N 40º 46' 57.2" +/-0.1" W 74º 41' 23.5" +/-0.1"

FN20ps.77GU31 +/-
V +5058.3438 H +1504.2531 +/-

http://home.earthlink.net/~rcmcc

To steal ideas from one person is plagiarism.
To steal from many is research.
- Steven Wright