Subject: [WSFA] Re: Voyager 1 anniversary
To: WSFA members <WSFAlist at KeithLynch.net>
From: "Mike B." <omni at omniphile.com>
Date: Wed, 6 Sep 2017 12:17:17 -0400

On 9/5/2017 10:41 PM, Michael Walsh wrote:
>
>> And it's been sending back incredible images.
>>
>> https://apod.nasa.gov/apod/ap170905.html
>>
>> mjw

Interesting image.=C2=A0=C2=A0 Any ideas why the shadow of Io isn't oval?=

 From the lighting on Europa, the sun is apparently to the right and
slightly behind the camera.=C2=A0 That means that shadows are being cast =
well
to the left of the bodies generating them (and Europa's not being in
view tends to confirm that)...so Io is way off to the right.=C2=A0 I'd ex=
pect
that the shadow hitting Jupiter at such an angle to be smeared out into
an oval, not what appears to be a perfect circle.=C2=A0 I'd only expect t=
hat
if the shadow, and Io were pretty much lined up.

-- Mike B.