[FPSPACE] Quake rattled Earth's orbit ?
CHARLES, JOHN B. (JSC-SL) (NASA)
john.b.charles at nasa.gov
Wed Dec 29 15:43:58 EST 2004
I haven't read the report. Did the USGS specify what it meant by "Earth's
orbit"? If Earth's orbit around the Sun, then I don't understand the
mechanism. ISS timing would seem to be more influenced by Earth's rotation
about its own axis, but 2 seconds seems to me like a large change.
The most common (mis)use of the phrase "Earth's orbit" is IMHO in reference
to satellite orbits around Earth, or "Earth orbit" (no apostrophe+s). No
expert but I imagine a mass shift within Earth can affect satellite orbits.
(similar to what lunar mascons did for lunar orbits.)
JBC via Blackberry
From: fpspace-bounces at friends-partners.org
<fpspace-bounces at friends-partners.org>
To: fpspace at friends-partners.org <fpspace at friends-partners.org>
Sent: Wed Dec 29 09:46:48 2004
Subject: [FPSPACE] Quake rattled Earth's orbit ?
This morning I managed to catch ISS skipping across the moon.
It arrived nearly two seconds early , and was slightly south of the
The US Geological Survey is quoted today as saying that the quake may have
rattled earth's orbit.....
I pretty sure the time difference I encountered this morning may be due to
my incorrect GPS time synchronisation.....but would be interested to know if
anyone else suspects a slight orbit change.
BTW video of this mornings transit can be found at
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