In this iconic lunar orbit rendezvous photo of John Houbolt, why do arrows #5 and #6 point the “wrong” way?Why did the rendezvous attempt fail on Gemini 4?Text of John Houbolt's letter proposing Lunar Orbit Rendezvous for Apollo?Do we sufficiently understand mechanics of Lagrange point stationkeeping for EML2 rendezvous and assembly?If Space Adventures actually does a Soyuz around the Moon, will this be the first real Earth Orbit Rendezvous launch?Who is the unnamed astronaut in this uncredited photo used in commercial promotional material?Why does the Apollo-8 Trans-Lunar Injection burn appear to be pulsing in this photo?Was this the first-ever photo of a full moon very close to lunar new year?Does the arrow in this SOHO trajectory animation point heliocentric prograde, or towards the Sun?What does this SpaceX tweeted photo show and what causes the pure red and blue color?What's this mini-cupola-looking object in this photo from the ISS?
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In this iconic lunar orbit rendezvous photo of John Houbolt, why do arrows #5 and #6 point the “wrong” way?
Why did the rendezvous attempt fail on Gemini 4?Text of John Houbolt's letter proposing Lunar Orbit Rendezvous for Apollo?Do we sufficiently understand mechanics of Lagrange point stationkeeping for EML2 rendezvous and assembly?If Space Adventures actually does a Soyuz around the Moon, will this be the first real Earth Orbit Rendezvous launch?Who is the unnamed astronaut in this uncredited photo used in commercial promotional material?Why does the Apollo-8 Trans-Lunar Injection burn appear to be pulsing in this photo?Was this the first-ever photo of a full moon very close to lunar new year?Does the arrow in this SOHO trajectory animation point heliocentric prograde, or towards the Sun?What does this SpaceX tweeted photo show and what causes the pure red and blue color?What's this mini-cupola-looking object in this photo from the ISS?
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
$begingroup$
The NPR.org news item Meet John Houbolt: He Figured Out How To Go To The Moon, But Few Were Listening shows the iconic photo of John Houbolt next to a black board showing a free return scenario.
I have always wondered why arrow #5 (top one near the Moon) appears to be pointed the wrong way, and recently I realized that #6 does as well. Why is this?
If it doesn't indicate the direction of spacecraft motion, what does it point towards?
Click image for full size
American aerospace engineer John Houbolt as he stands at a chalkboard in July 1962 showing his lunar orbit rendezvous plan for landing astronauts on the moon.
nasa history identify-this-object rendezvous
asked 9 hours ago
uhohuhoh
46.4k22 gold badges186 silver badges609 bronze badges
$endgroup$
add a comment |
$begingroup$
The NPR.org news item Meet John Houbolt: He Figured Out How To Go To The Moon, But Few Were Listening shows the iconic photo of John Houbolt next to a black board showing a free return scenario.
I have always wondered why arrow #5 (top one near the Moon) appears to be pointed the wrong way, and recently I realized that #6 does as well. Why is this?
If it doesn't indicate the direction of spacecraft motion, what does it point towards?
Click image for full size
American aerospace engineer John Houbolt as he stands at a chalkboard in July 1962 showing his lunar orbit rendezvous plan for landing astronauts on the moon.
nasa history identify-this-object rendezvous
asked 9 hours ago
uhohuhoh
46.4k22 gold badges186 silver badges609 bronze badges
$endgroup$
6
$begingroup$
Aren't they burns?
$endgroup$
– Organic Marble
9 hours ago
$begingroup$
@OrganicMarble oh, the arrow indicating the (approximate) direction of thrust does seem to fit, with the skew of #4 and #10 indicating a correction maneuver. It's that simple?
$endgroup$
– uhoh
8 hours ago
$begingroup$
Do you happen to know what "escape weights" refers to?
$endgroup$
– Magic Octopus Urn
6 hours ago
$begingroup$
@MagicOctopusUrn I don't know for a fact but looking at the drawings and the graph below that label, it appears to be the mass of the craft that leaves the moon for the Earth.
$endgroup$
– Organic Marble
4 hours ago
$begingroup$
@MagicOctopusUrn The plot at bottom right shows $w_E/W_E$ as a function of $w_L/w_O$. What the plot (and the diagrams near the top) mean and approximate numbers that go into it might make an excellent follow-up question.
$endgroup$
– uhoh
2 hours ago
add a comment |
$begingroup$
The NPR.org news item Meet John Houbolt: He Figured Out How To Go To The Moon, But Few Were Listening shows the iconic photo of John Houbolt next to a black board showing a free return scenario.
I have always wondered why arrow #5 (top one near the Moon) appears to be pointed the wrong way, and recently I realized that #6 does as well. Why is this?
If it doesn't indicate the direction of spacecraft motion, what does it point towards?
Click image for full size
American aerospace engineer John Houbolt as he stands at a chalkboard in July 1962 showing his lunar orbit rendezvous plan for landing astronauts on the moon.
nasa history identify-this-object rendezvous
asked 9 hours ago
uhohuhoh
46.4k22 gold badges186 silver badges609 bronze badges
$endgroup$
The NPR.org news item Meet John Houbolt: He Figured Out How To Go To The Moon, But Few Were Listening shows the iconic photo of John Houbolt next to a black board showing a free return scenario.
I have always wondered why arrow #5 (top one near the Moon) appears to be pointed the wrong way, and recently I realized that #6 does as well. Why is this?
If it doesn't indicate the direction of spacecraft motion, what does it point towards?
Click image for full size
American aerospace engineer John Houbolt as he stands at a chalkboard in July 1962 showing his lunar orbit rendezvous plan for landing astronauts on the moon.
nasa history identify-this-object rendezvous
nasa history identify-this-object rendezvous
asked 9 hours ago
uhohuhoh
46.4k22 gold badges186 silver badges609 bronze badges
asked 9 hours ago
uhohuhoh
46.4k22 gold badges186 silver badges609 bronze badges
edited 7 hours ago
uhoh
asked 9 hours ago
uhohuhoh
46.4k22 gold badges186 silver badges609 bronze badges
asked 9 hours ago
uhohuhoh
46.4k22 gold badges186 silver badges609 bronze badges
asked 9 hours ago
uhohuhoh
46.4k22 gold badges186 silver badges609 bronze badges
46.4k22 gold badges186 silver badges609 bronze badges
6
$begingroup$
Aren't they burns?
$endgroup$
– Organic Marble
9 hours ago
$begingroup$
@OrganicMarble oh, the arrow indicating the (approximate) direction of thrust does seem to fit, with the skew of #4 and #10 indicating a correction maneuver. It's that simple?
$endgroup$
– uhoh
8 hours ago
$begingroup$
Do you happen to know what "escape weights" refers to?
$endgroup$
– Magic Octopus Urn
6 hours ago
$begingroup$
@MagicOctopusUrn I don't know for a fact but looking at the drawings and the graph below that label, it appears to be the mass of the craft that leaves the moon for the Earth.
$endgroup$
– Organic Marble
4 hours ago
$begingroup$
@MagicOctopusUrn The plot at bottom right shows $w_E/W_E$ as a function of $w_L/w_O$. What the plot (and the diagrams near the top) mean and approximate numbers that go into it might make an excellent follow-up question.
$endgroup$
– uhoh
2 hours ago
add a comment |
6
$begingroup$
Aren't they burns?
$endgroup$
– Organic Marble
9 hours ago
$begingroup$
@OrganicMarble oh, the arrow indicating the (approximate) direction of thrust does seem to fit, with the skew of #4 and #10 indicating a correction maneuver. It's that simple?
$endgroup$
– uhoh
8 hours ago
$begingroup$
Do you happen to know what "escape weights" refers to?
$endgroup$
– Magic Octopus Urn
6 hours ago
$begingroup$
@MagicOctopusUrn I don't know for a fact but looking at the drawings and the graph below that label, it appears to be the mass of the craft that leaves the moon for the Earth.
$endgroup$
– Organic Marble
4 hours ago
$begingroup$
@MagicOctopusUrn The plot at bottom right shows $w_E/W_E$ as a function of $w_L/w_O$. What the plot (and the diagrams near the top) mean and approximate numbers that go into it might make an excellent follow-up question.
$endgroup$
– uhoh
2 hours ago
6
6
$begingroup$
Aren't they burns?
$endgroup$
– Organic Marble
9 hours ago
$begingroup$
Aren't they burns?
$endgroup$
– Organic Marble
9 hours ago
$begingroup$
@OrganicMarble oh, the arrow indicating the (approximate) direction of thrust does seem to fit, with the skew of #4 and #10 indicating a correction maneuver. It's that simple?
$endgroup$
– uhoh
8 hours ago
$begingroup$
@OrganicMarble oh, the arrow indicating the (approximate) direction of thrust does seem to fit, with the skew of #4 and #10 indicating a correction maneuver. It's that simple?
$endgroup$
– uhoh
8 hours ago
$begingroup$
Do you happen to know what "escape weights" refers to?
$endgroup$
– Magic Octopus Urn
6 hours ago
$begingroup$
Do you happen to know what "escape weights" refers to?
$endgroup$
– Magic Octopus Urn
6 hours ago
$begingroup$
@MagicOctopusUrn I don't know for a fact but looking at the drawings and the graph below that label, it appears to be the mass of the craft that leaves the moon for the Earth.
$endgroup$
– Organic Marble
4 hours ago
$begingroup$
@MagicOctopusUrn I don't know for a fact but looking at the drawings and the graph below that label, it appears to be the mass of the craft that leaves the moon for the Earth.
$endgroup$
– Organic Marble
4 hours ago
$begingroup$
@MagicOctopusUrn The plot at bottom right shows $w_E/W_E$ as a function of $w_L/w_O$. What the plot (and the diagrams near the top) mean and approximate numbers that go into it might make an excellent follow-up question.
$endgroup$
– uhoh
2 hours ago
$begingroup$
@MagicOctopusUrn The plot at bottom right shows $w_E/W_E$ as a function of $w_L/w_O$. What the plot (and the diagrams near the top) mean and approximate numbers that go into it might make an excellent follow-up question.
$endgroup$
– uhoh
2 hours ago
add a comment |
1 Answer
1
active
oldest
votes
$begingroup$
They are burns, with the direction of the arrow roughly indicating the direction of thrust.
- Ascent
- Earth orbit insertion
- Trans-lunar injection
- Midcourse correction
- Lunar orbit insertion
- Burn to drop out of lunar orbit for landing (LM)
- Ascent from lunar surface (LM)
- Lunar orbit insertion (LM)
- Trans-Earth injection
- Midcourse correction
Whew! Found a reference. Here's a diagram by Houbolt with the same nomenclature (sans vectoring).
answered 8 hours ago
Organic MarbleOrganic Marble
70.3k4 gold badges202 silver badges303 bronze badges
$endgroup$
add a comment |
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$begingroup$
They are burns, with the direction of the arrow roughly indicating the direction of thrust.
- Ascent
- Earth orbit insertion
- Trans-lunar injection
- Midcourse correction
- Lunar orbit insertion
- Burn to drop out of lunar orbit for landing (LM)
- Ascent from lunar surface (LM)
- Lunar orbit insertion (LM)
- Trans-Earth injection
- Midcourse correction
Whew! Found a reference. Here's a diagram by Houbolt with the same nomenclature (sans vectoring).
answered 8 hours ago
Organic MarbleOrganic Marble
70.3k4 gold badges202 silver badges303 bronze badges
$endgroup$
add a comment |
$begingroup$
They are burns, with the direction of the arrow roughly indicating the direction of thrust.
- Ascent
- Earth orbit insertion
- Trans-lunar injection
- Midcourse correction
- Lunar orbit insertion
- Burn to drop out of lunar orbit for landing (LM)
- Ascent from lunar surface (LM)
- Lunar orbit insertion (LM)
- Trans-Earth injection
- Midcourse correction
Whew! Found a reference. Here's a diagram by Houbolt with the same nomenclature (sans vectoring).
answered 8 hours ago
Organic MarbleOrganic Marble
70.3k4 gold badges202 silver badges303 bronze badges
$endgroup$
add a comment |
$begingroup$
They are burns, with the direction of the arrow roughly indicating the direction of thrust.
- Ascent
- Earth orbit insertion
- Trans-lunar injection
- Midcourse correction
- Lunar orbit insertion
- Burn to drop out of lunar orbit for landing (LM)
- Ascent from lunar surface (LM)
- Lunar orbit insertion (LM)
- Trans-Earth injection
- Midcourse correction
Whew! Found a reference. Here's a diagram by Houbolt with the same nomenclature (sans vectoring).
answered 8 hours ago
Organic MarbleOrganic Marble
70.3k4 gold badges202 silver badges303 bronze badges
$endgroup$
They are burns, with the direction of the arrow roughly indicating the direction of thrust.
- Ascent
- Earth orbit insertion
- Trans-lunar injection
- Midcourse correction
- Lunar orbit insertion
- Burn to drop out of lunar orbit for landing (LM)
- Ascent from lunar surface (LM)
- Lunar orbit insertion (LM)
- Trans-Earth injection
- Midcourse correction
Whew! Found a reference. Here's a diagram by Houbolt with the same nomenclature (sans vectoring).
answered 8 hours ago
Organic MarbleOrganic Marble
70.3k4 gold badges202 silver badges303 bronze badges
edited 8 hours ago
answered 8 hours ago
Organic MarbleOrganic Marble
70.3k4 gold badges202 silver badges303 bronze badges
answered 8 hours ago
Organic MarbleOrganic Marble
70.3k4 gold badges202 silver badges303 bronze badges
answered 8 hours ago
Organic MarbleOrganic Marble
70.3k4 gold badges202 silver badges303 bronze badges
70.3k4 gold badges202 silver badges303 bronze badges
add a comment |
add a comment |
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6
$begingroup$
Aren't they burns?
$endgroup$
– Organic Marble
9 hours ago
$begingroup$
@OrganicMarble oh, the arrow indicating the (approximate) direction of thrust does seem to fit, with the skew of #4 and #10 indicating a correction maneuver. It's that simple?
$endgroup$
– uhoh
8 hours ago
$begingroup$
Do you happen to know what "escape weights" refers to?
$endgroup$
– Magic Octopus Urn
6 hours ago
$begingroup$
@MagicOctopusUrn I don't know for a fact but looking at the drawings and the graph below that label, it appears to be the mass of the craft that leaves the moon for the Earth.
$endgroup$
– Organic Marble
4 hours ago
$begingroup$
@MagicOctopusUrn The plot at bottom right shows $w_E/W_E$ as a function of $w_L/w_O$. What the plot (and the diagrams near the top) mean and approximate numbers that go into it might make an excellent follow-up question.
$endgroup$
– uhoh
2 hours ago