Lester Veenstra wrote:
Now this begins to make some sense;
Of course the geosync satellites do go into eclipse season trice a year,
during which each day the satellite is passing through the Earth's shadow
for a variable period.
To pass though the shadow of a solar lunar eclipse, the eclipse would have
to be visible on the ground at satellite sub-satellite point ( nominal, the
equator). For the Inmarsat's this would be at:
24.8 E
25.1 E
64.5 E
109.0 E
143.5 E
178.1 E
218.0 $
261.9 E
262.4 E
306.0 E
344.5 E
But, since there are satellites virtually anywhere along the arc, there is
no reason to restrict observations to INMARSAT. But INMARSATs do provide a
easy target for an observer with simple L-Band equipment.
Of course I would expect to see a shift in an onboard crystal frequency (but
not a "jump") simply from the thermal changes.
It was assumed that the crystals was locked to Cesium or Rubidium, and
hence it would chase up the error.
Cheers,
Magnus
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