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 Jul 18 at 15:04
uhohuhoh
47.9k22 gold badges192 silver badges626 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 Jul 18 at 15:04
uhohuhoh
47.9k22 gold badges192 silver badges626 bronze badges
$endgroup$
15
$begingroup$
Aren't they burns?
$endgroup$
– Organic Marble
Jul 18 at 15:06
$begingroup$
@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
Jul 18 at 15:20
$begingroup$
Do you happen to know what "escape weights" refers to?
$endgroup$
– Magic Octopus Urn
Jul 18 at 17:42
1
$begingroup$
@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
Jul 18 at 19:22
2
$begingroup$
@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
Jul 18 at 21:58
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 Jul 18 at 15:04
uhohuhoh
47.9k22 gold badges192 silver badges626 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 Jul 18 at 15:04
uhohuhoh
47.9k22 gold badges192 silver badges626 bronze badges
asked Jul 18 at 15:04
uhohuhoh
47.9k22 gold badges192 silver badges626 bronze badges
edited Jul 18 at 16:19
uhoh
asked Jul 18 at 15:04
uhohuhoh
47.9k22 gold badges192 silver badges626 bronze badges
asked Jul 18 at 15:04
uhohuhoh
47.9k22 gold badges192 silver badges626 bronze badges
asked Jul 18 at 15:04
uhohuhoh
47.9k22 gold badges192 silver badges626 bronze badges
47.9k22 gold badges192 silver badges626 bronze badges
15
$begingroup$
Aren't they burns?
$endgroup$
– Organic Marble
Jul 18 at 15:06
$begingroup$
@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
Jul 18 at 15:20
$begingroup$
Do you happen to know what "escape weights" refers to?
$endgroup$
– Magic Octopus Urn
Jul 18 at 17:42
1
$begingroup$
@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
Jul 18 at 19:22
2
$begingroup$
@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
Jul 18 at 21:58
add a comment |
15
$begingroup$
Aren't they burns?
$endgroup$
– Organic Marble
Jul 18 at 15:06
$begingroup$
@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
Jul 18 at 15:20
$begingroup$
Do you happen to know what "escape weights" refers to?
$endgroup$
– Magic Octopus Urn
Jul 18 at 17:42
1
$begingroup$
@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
Jul 18 at 19:22
2
$begingroup$
@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
Jul 18 at 21:58
15
15
$begingroup$
Aren't they burns?
$endgroup$
– Organic Marble
Jul 18 at 15:06
$begingroup$
Aren't they burns?
$endgroup$
– Organic Marble
Jul 18 at 15:06
$begingroup$
@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
Jul 18 at 15:20
$begingroup$
@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
Jul 18 at 15:20
$begingroup$
Do you happen to know what "escape weights" refers to?
$endgroup$
– Magic Octopus Urn
Jul 18 at 17:42
$begingroup$
Do you happen to know what "escape weights" refers to?
$endgroup$
– Magic Octopus Urn
Jul 18 at 17:42
1
1
$begingroup$
@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
Jul 18 at 19:22
$begingroup$
@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
Jul 18 at 19:22
2
2
$begingroup$
@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
Jul 18 at 21:58
$begingroup$
@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
Jul 18 at 21:58
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 Jul 18 at 15:46
Organic MarbleOrganic Marble
72.3k4 gold badges210 silver badges310 bronze badges
$endgroup$
5
$begingroup$
Ooh, buuuuuurn.
$endgroup$
– David Richerby
Jul 19 at 14:45
add a comment |
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1 Answer
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1 Answer
1
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oldest
votes
active
oldest
votes
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 Jul 18 at 15:46
Organic MarbleOrganic Marble
72.3k4 gold badges210 silver badges310 bronze badges
$endgroup$
5
$begingroup$
Ooh, buuuuuurn.
$endgroup$
– David Richerby
Jul 19 at 14:45
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 Jul 18 at 15:46
Organic MarbleOrganic Marble
72.3k4 gold badges210 silver badges310 bronze badges
$endgroup$
5
$begingroup$
Ooh, buuuuuurn.
$endgroup$
– David Richerby
Jul 19 at 14:45
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 Jul 18 at 15:46
Organic MarbleOrganic Marble
72.3k4 gold badges210 silver badges310 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 Jul 18 at 15:46
Organic MarbleOrganic Marble
72.3k4 gold badges210 silver badges310 bronze badges
edited Jul 18 at 16:07
answered Jul 18 at 15:46
Organic MarbleOrganic Marble
72.3k4 gold badges210 silver badges310 bronze badges
answered Jul 18 at 15:46
Organic MarbleOrganic Marble
72.3k4 gold badges210 silver badges310 bronze badges
answered Jul 18 at 15:46
Organic MarbleOrganic Marble
72.3k4 gold badges210 silver badges310 bronze badges
72.3k4 gold badges210 silver badges310 bronze badges
5
$begingroup$
Ooh, buuuuuurn.
$endgroup$
– David Richerby
Jul 19 at 14:45
add a comment |
5
$begingroup$
Ooh, buuuuuurn.
$endgroup$
– David Richerby
Jul 19 at 14:45
5
5
$begingroup$
Ooh, buuuuuurn.
$endgroup$
– David Richerby
Jul 19 at 14:45
$begingroup$
Ooh, buuuuuurn.
$endgroup$
– David Richerby
Jul 19 at 14:45
add a comment |
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15
$begingroup$
Aren't they burns?
$endgroup$
– Organic Marble
Jul 18 at 15:06
$begingroup$
@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
Jul 18 at 15:20
$begingroup$
Do you happen to know what "escape weights" refers to?
$endgroup$
– Magic Octopus Urn
Jul 18 at 17:42
1
$begingroup$
@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
Jul 18 at 19:22
2
$begingroup$
@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
Jul 18 at 21:58