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Forum:Mercury - Gemini - Apollo
Topic:Earth photos taken on the lunar surface
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HeadshotYes LM-12, your reasoning is correct also. The angle of the Earth's terminator would vary by latitude as well.

It is best to measure the angle of the terminator during half-Earth, when the terminator is a straight line. Despite what that excellent video shows, when the Earth is gibbous there is some subjectivity to determining the terminator angle.

GlintThe angle of the terminator primarily varies by season. The seasons are caused by the earth's axial tilt.
LM-12Frame 9189 is a LM and Earth view from the lunar surface on Apollo 14.

None of the Apollo 15 and Apollo 16 Hasselblad photos taken on the lunar surface seem to show the Earth. That is a surprise. Can you find any?

LM-12I take it from the "superb" Earthrise video that One Big Monkey posted above that (1) the angle of the Earth's axis relative to the lunar horizon changes with latitude and can be used to determine lunar latitude, and (2) the elevation of the Earth above the lunar horizon changes with longitude and can be used to determine lunar longitude.

So, if one can do all the calculations, the (approximate) location where an Earth photo like 20961 was taken can be determined from the photo alone? Amazing.

LM-12The view of Earth in the Apollo 11 emblem is wrong for where they landed. And when they landed also, I believe.
moorouge
quote:
Originally posted by LM-12:
The view of Earth in the Apollo 11 emblem is wrong for where they landed. And when they landed also, I believe.

It also needs to be rotated 90 degrees. I believe Mike Collins has owned up to his astronomical error.

LM-12"... wrong for where they landed" is the 90 degree error.

An Earth view like frame 5924 should be on the emblem: upper half in sunlight with north pole at right. When Apollo 11 landed at 4:17:39 p.m. EDT, the eastern part of North America should have been visible in the sunlit half.

Robert Pearlman
quote:
Originally posted by moorouge:
I believe Mike Collins has owned up to his astronomical error.
From "Carrying the Fire" by Collins:
I added a small earth in the background and drew the sunshine coming from the wrong direction...

LM-12Where would you have to be on the moon and when would you have to be on the moon to see the Earth view in the Apollo 11 patch?

My guess is in the northwest quadrant of the moon near the lunar north pole, on a waning crescent moon.

LM-12The sunlight direction in the Apollo 14 emblem also looks wrong. In the Apollo 8 emblem, the moon is sunlit from the right as seen from the Earth. That seems right for when Apollo 8 flew.

An interesting change in the Apollo 8 emblem would be to switch the positions of the Earth and the moon, and have the moon in the foreground. Then the names of the three crewmembers would be in orbit at the moon.

LM-12Was it ever determined who took Apollo 11 frames 5923 and 5924?

In frame 5924, there is a bright object seen at right center. Is that a star or perhaps a planet, or is it just a flaw on the film?

LM-12From the Apollo 12 mission transcripts at the end of EVA-2, when Al Bean was back inside the LM and Pete Conrad was still on the lunar surface:
CDR-EVA: Did you ever get the picture of the LM and Earth?

LMP-LM: No.

CDR-EVA: Oh, that's a shame.

LMP-LM: I know it.

CDR-EVA: Hi Earth; I can see us. It's up over the LM now. It's the first time I've had a chance to look. You're about a quarter Earth.

LM-12
I added a small earth in the background and drew the sunshine coming from the wrong direction...
Has there ever been an illustration showing a "corrected" version of the Apollo 11 emblem? That is, a design that replaces the wrong view of Earth in the original emblem with a correct view of Earth as seen in photo AS11-44-6551 for example.

DFBrunswickDuring the Apollo missions, was Earth always visible from the lunar surface? I presume not because there were no photographs of Earth that I know from the lunar surface during the Apollo 11 and 12 missions.

In fact the only photographs of Earth from the lunar surface that I know of were from the Apollo 17 mission. Did any of the other Apollo missions (Apollos 11 - 16) photograph Earth from the surface of the moon?

Editor's note: Threads merged.

Jurg BolliThe Earth is always visible from the near side of the moon in the same place in the sky, the only thing that changes are the phase that the Earth is in.
HeadshotThe Earth does not stay precisely in the same spot in the lunar sky. Due to lunar libration, the Earth wanders, albiet slightly, to and fro along a short line during a lunar orbit.
One Big Monkey
quote:
Originally posted by DFBrunswick:
Did any of the other Apollo missions (Apollos 11 - 16) photograph Earth from the surface of the moon?
The Earth was photographed from the surface by Apollo 11 and Apollo 14 and was also broadcast on TV during Apollo 16.
moorougeLM-12 - can you please email me (address on profile) as I have something that I'd like your opinion on regarding earth photos taken on the Moon.

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