Walk again on the moon in 2024

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Re: Walking on the Moon in 2024




by Remundo » 02/01/23, 14:24

space travel is never done in a straight line because it is extremely energy intensive.

we are satisfied with impulses to pass from one circular orbit to another.

Between these 2 orbits, the trajectory is a half-ellipse of transfer.

So it takes a long time to arrive. But on the ellipse, no energy consumption.
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Re: Walking on the Moon in 2024




by Christophe » 02/01/23, 14:28

Yes of course on the trajectory is in 8 or infinity…

But that doesn't make 7 times more km…is it? : Shock:
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Re: Walking on the Moon in 2024




by Remundo » 02/01/23, 15:38

well already just half a turn around the earth in geostationary orbit... Pi x 42 km = 000 km

I think that we need stabilization orbits both on departure from Earth and on arrival on the Lunar. The time to check if everything is OK, to launch the instructions...
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Re: Walking on the Moon in 2024




by Obamot » 02/01/23, 15:57

The advantage is that it leaves time for the crew to take selfies : Cheesy: I —>[_]
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Re: Walking on the Moon in 2024




by Christophe » 02/01/23, 16:17

Remundo wrote:well already just half a turn around the earth in geostationary orbit... Pi x 42 km = 000 km

I think that we need stabilization orbits both on departure from Earth and on arrival on the Lunar. The time to check if everything is OK, to launch the instructions...


There is no question of going through a geostationary orbit in a transition to the Moon...(where did you read that???)

On Apollo 11 (and 8 also very probably), they circled the Earth twice in low orbit to do the various checks and to accelerate to reach the escape velocity...

1 lap in low orbit at 27 km/h is around 000h1...

Same on the Moon. Before launching Eagle, I think they did (at least) 5 or 6 rotations...(the exact figure is in the Arte doc: it was New Year's Eve! : Mrgreen: )

So yes there were orbits but they alone cannot explain the difference in duration / speed... there were indeed 2,5 days of transition... at 40 km/h escape velocity, plus 000 days to cover 2 km... there is something that escapes me... : roll: : roll: : roll:
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Re: Walking on the Moon in 2024




by Christophe » 02/01/23, 16:20

Here I found the passage on the orbits:

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Re: Walking on the Moon in 2024




by Remundo » 02/01/23, 18:07

I'm not saying that we necessarily do geostationary, I gave an order of magnitude to understand the distances involved and that we go around in circles before arriving.
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Re: Walking on the Moon in 2024




by Christophe » 02/01/23, 18:22

Yes they go around in circles but not that much eh...(and less than some on this forum in all cases !! : Lol: : Lol: : Lol: )

I wonder if it's not a history of repository ???

40 km is geocentric...but the escape velocity is a tangent to the Earth in the direction of the Moon and the earth-moon distance is also geocentric...right? : Shock: : Mrgreen: : Shock: So... it must not be that and I'm still dry... :?: :?:
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Re: Walking on the Moon in 2024




by Remundo » 02/01/23, 18:32

380 km is a difference in radius between 000 circles.

The Moon also revolves around the Earth in the geocentric frame of reference, does the satellite approach it in pursuit or frontally?...

in short, you see, distances in space are long and not direct, don't worry, NASA has studied the problem extensively :P, sometimes across!
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Re: Walking on the Moon in 2024




by Christophe » 02/01/23, 18:40

I have no doubt (yes!) that NASA has the answer! But I don't have it from where I use your brain too... (it never hurts if?)

Concerning the movement of the Moon, I thought about it too, but it's not 2.5/28th of the moon's revolution that are enough to explain, even if it still adds an arc of around 220 km! So it's not negligible...but there's still something else!

Let's think again!

What is the escape velocity of the Moon and that of low orbit? That will tell us how much they had to slow down... maybe that's the answer (well a combination of all that...)
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