[AZ-Observing] Re: How the "Earthrise" images were captured: resend
- From: Dan Heim <dan@xxxxxxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Mon, 03 Feb 2014 11:21:34 -0700
Just did a quick back-of-the-envelope calculation. With their orbital
period of 2 hours, they were moving about 3 degrees/minute. So the 1.85
degree disc of Full Earth would take about 0.62 minutes (37 seconds) to
rise. In that respect, the simulation in that link
(http://www.youtube.com/embed/dE-vOscpiNc) was right on. Allowing for
the time to find and load the color film, seems like they'd catch the
Earth about 2.5 Earth-diameters above the horizon just like in that
classic photo. Still have to wonder, why the rush? They had 10 orbits
planned, and I assume that photo was taken on the first orbit. -Dan Heim
On 2/3/2014 10:49 AM, Rick Tejera wrote:
> Dan,
> Yes the first shot was B&W. Earth is noticably lower in the B&W shot.
>
> The mission plan in lunar orbit was directed towards reconnasance of the
> Apollo 11 landing sites (yesn there were two) and general photography of the
> lunar surface. So it stands to reason that they just never thought about
> pictures of earth.
>
> 73
> Rick Tejera K7TEJ
> Saguaro Astronomy Club
> www.saguaroastro.org
> Thunderbird Amateur Radio Club
> www.w7tbc.org
>
>
>
> Dan Heim<dan@xxxxxxxxxxxxx> wrote:
>
>> I assume they were using B/W film originally, because it provided better
>> resolution than did color back in 1968? Hard to believe nobody at NASA
>> anticipated that Earthrise photo op. -Dan Heim
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