Hello Patrick and all!
Thanks for explaining the impact of the earths radius for the
distance calculations. Comparing the results of one programme
against others may not be meaningful unless it is known what
value these programmes are using.
But for my part I don't mind if the logchecker gives me more
points than I've claimed...
73 de Goetz
dj3iw@t-online.de
----- Original Message -----
From: <f6irf@free.fr>
To: <rtty@contesting.com>
Sent: Tuesday, October 12, 2004 10:31 PM
Subject: RE: [RTTY] Makrothen & Claimed Scores
> Hi everybody...
>
> Preamble
> First of all I am not trying to start a useless polemic... because as
mentionned
> in each of my mail on the topic, it does not really matter...
>
> Second preamble (I have to be very careful!)
> I am not a geograph, or a mathematicien...
>
> BUT..
> I am curious, and a bit player... (otherwise I wouldn't be a contester...)
>
> So I wanted to find the reason why the distance calculation did not match
> between N1MM and the DK3VN calculator...
> On one side PA1M (from N1MM team) wrote me that they had checked their
distance
> calculation against other popular VHF loggers, like TAC-log, and that
> they were in agreement... Writelog users also confirmed on 3830 that WL calc
was
> also below the online calc.
> On my side also did some testings with VQ-log with DX-atlas and finaly with
my
> Garmin GPS - all confirmed that the N1MM calculation was correct...
>
> So I went back to Waldemar's formula and again it seemed to be correct - for
> example the antipodal point of my square JN35AU being AE34AD (somewhere near
> Pitcairn Island!) was calculated as 20,038kms which is exactly
PI*R(20037.5805)
>
> So what was wrong...
> It could not be PI - so it had to be R !
>
> As mentionned on its page DK3VN is using 6378.16kms as radius for the earth.
> Like my GPS does, the concensus seems to use the WGS84 "mean radius" (6371
kms)
> and not the equatorial radius 6378.1 kms...
> That's it !
> Now as there is more than one "mean value", the discussion could continue
for
> ever, but as mentionned in the preamble I am not a specialist...
>
> Once again just for the fun and my curiosity...
> (In any case it won't impact the contest results...)
>
> Best regards - Patrick
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