[WT-support] Gray line and sunrise/sunset calculations in Win-Test

[Bob Wilson, N6TV]

At present, Win-Test's World
Map<http://docs.win-test.com/wiki/Menu:Windows#World_Map>and Check
Multipliers window<http://docs.win-test.com/wiki/Menu:Windows#Check_Multipliers>seem
to plot local sunrise and sunset times at sea level, but ionospheric
twilight is defined by the sunrise and sunset times *in the D and F layers*,
which is quite different.

OH6BG publishes detailed D and F layer sunrise and sunset times in detailed
tables, here <http://lipas.uwasa.fi/%7Ejpe/tlite.shtml>.

As you can see, the most likely time for gray line propagation is from 60 to
30 minutes *before* local sunrise, and from 30 and 60 minutes *after* local
sunset (approximately).  It would be nice if Win-Test could help you see
this.

FYI, Geoclock plots the D and F layer twilight area quite nicely, as shown
here <http://home.att.net/%7Egeoclock/ham.htm>.

It would be nice if Win-Test could display D and F layer illumination in
both the world map and the check multiplier windows.

I also propose a more muted color scheme than the bright yellow bars that we
have at the bottom of the Check Multipliers window today, with gray bars to
indicate gray line propagation time (and also a way to disable the extra
bars completely so the window looks the same as it did in Win-Test V3):

[image: CheckMultipliersWithDandFGraylinePlot.PNG]

A copy of this illustration is posted online
here<http://www.kkn.net/%7En6tv/CheckMultipliersWithDandFGraylinePlot.PNG>in
case it is stripped by the reflector.

73,
Bob, N6TV
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