[Moon-Net] Geometric (Spatial) polarization calculator?

Roger Rehr W3SZ w3sz73 at gmail.com
Fri Nov 11 22:04:41 CET 2016

Hi Curt:

For a given station the Polar Offset is related to both Az and El of the
moon and station Latitude by the equation:

P = arctg((sinLat*cosEl-cosLat*cosAz*sinEl)/cosLat*sinAz)

Geometric Spatial Offset for 2 stations is just P1-P2 where P1 is the
offset of one station and P2 is that of the other.

All of this is in the excellent talk given by IK1UWL and IK3TV at the
superb EME2016 near Venice.  The formula is on page 8 of the slides at:
and the formula is on page 11 of the proceedings which are at:

Roger Rehr

On 11/11/2016 3:23 PM, Curt Nixon wrote:
> Hi Bob:
> I haven't spent much time looking at that value but have a (perhaps)
> un-informed question:  Are you sure that that value has a functional
> relation to the position of the moon (time?)  My impression was it was
> simply the spherical geometry of the two earth locations.   Forgive my
> ignorance.
> Curt
> On 11/11/2016 2:20 PM, Bob Atkins wrote:
>> Is there a program which will show the geometric (spatial)
>> polarization rotation between two stations and allow you to easily 
>> go forward and backward in time to see how it changes?  I know WSJT
>> does the calculation at the current time. EMECalc SkyMap allows you
>> to scroll backwards and forwards in time, but only shows moon data
>> (alt/ez etc.) for the home station. I saw a reference somewhere that
>> said EMECalc displays spatial polarization, but if it does I haven't
>> found it.
>> The Astronomical Data window of WSJT does display the info but I
>> don't see any easy way to scroll backwards and forwards in time like
>> you can in the EMECalc Skymap.
>> What would be really nice would be a map of the world you could click
>> on to set your location and which would then calculate a contour
>> (color coded?) map showing spatial polarization across the hemisphere
>> that could see the moon - and shift backwards and forwards in time - 
>> but that's almost certainly wishing for too much!
>> Bob
>> KA1GT
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