Ngoc Nguyen

42179 Planet Earth and Moon in Orbit

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10 hours ago, Davidz90 said:

If you are talking about Earth's axis precession, it is 1 rotation in 26000 years so basically stationary for all intents and purposes. So the part does rotate, but in the sense that it remains fixed in relation to the base, properly demonstrating seasons.

Ah ok, cool. 

Thanks for enlightening me :) 

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[]

Edited by 2GodBDGlory
On second read, the joke seemed too open to misunderstanding

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Well, axle is "achse" in German. These two languages are surprisingly similiar, leading to many interesting misspellings on both sides.

 

Another early review, here print alignment seems pretty ok:

 

Edited by Davidz90

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5 hours ago, Maaboo the Witch said:

That is the most interesting spelling of "axle" I have ever seen.

Haha, you got me :laugh:

@Davidz90@Davidz90 explained it correctly. I am a native german speaker. 

 

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Again another misleading set in education. The sun is rotating on its own axis in "reality"? C'mon Lego. And whats about a proper set for the flatearth people...

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Well, the Sun does rotate on its axis. It just doesn't rotate as a rigid body. I don't have a problem with representing the Sun as rotating for this model.

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9 hours ago, Timorzelorzworz said:

And whats about a proper set for the flatearth people...

I've also wondered why TLG doesn't make a joke of it and releases a geocentric & flat earth B-model. But the risk of a "fecal storm" (or encouragement from some trolls) is probably too high.
I'm hoping for a MOC!:wink:

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12 hours ago, Maaboo the Witch said:

Tomorrow.

Ahahah, nice) Thanks mate! I consider this set as an a good example (hopefully) to demo in the simplest way our Solar System to my daughter

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Posted (edited)
On 2/27/2024 at 6:57 PM, Frequenzberater said:

0OaoSdL.jpeg

 

Does this thing also rotate? As far as I know the rotating achsle of the earth is not fixed

 

Edit: Apparently it does. Pretty cool :thumbup:

To be more precise, to a good approximation the Earth's axis points in a fixed direction relative to the stars (towards Polaris, in fact). This is what the model does, which requires that this part does rotate relative to the main sun-earth arm. This is achieved through gearing. Arguably the nicest feature of the model.

Edited by aeh5040

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Obviously there is a lot going on inside this small model. That is what I like for the technic series. 

I will definitely get one of this sets and build it with my son, as soon there is a proper discount. 

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I just built this, and am going to have to partially disassemble it to ensure midwinter is in late December instead of early February.

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Posted (edited)

I've now built this, and I regard it as one of the best sets ever. It's a pity there wasn't a bit more effort put into making it beautiful (especially the base), but the mechanics are outstanding, and it's a real pleasure to witness it IRL!

Edited by aeh5040

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16 hours ago, aeh5040 said:

I've now built this, and I regard it as one of the best sets ever. It's a pity there wasn't a bit more effort put into making it beautiful (especially the base), but the mechanics are outstanding, and it's a real pleasure to witness it IRL!

Agree. According to @grohl's review the mastermind behind this set is the late Jørn Thomsen, who also worked on the EV3 and Boost sets together with Carl Merriam. So it's his opus ultimum in a way.

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2 hours ago, Ngoc Nguyen said:

Hi everyone, this is Planets from RacingBrick. :laugh:

https://www.youtube.com/watch?v=abAfPpRejDM

Great review as always, and how nice of him to compliment our reverse engineers here in the forum for their work!

The set is as expected from the photos and analysis provided here, so I didn't learn much, but it's nice to have our thoughts confirmed. I'm sort of bummed about the complete lack of aesthetic touches but as @kbalage points out, it's great to see all the gears at work. I wonder if it would be possible to achieve some sort of finished look while not hiding the gears too much...

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Having just watched @kbalage’s video I find this a really interesting set and definitely one to add to the collection. I was one of the few people that got the Forma Koi set and I do wish TLG did a few more kinetic sculpture / mechanism type sets.

Unfortunately watching Sariels review proved to me why I generally avoid his videos these days. He obviously didn’t do the maths to work out the relative size / distance of the sun and earth … it’s huge! And I’d love to know how he’d solve the problems of the moon orbit and earth orbits not being perfect. For (I assume) most people they’re close enough, especially as this is very similar to lots or Orreries that have appeared through history

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Indeed, the orbit eccentricity of Earth is less than 2% so including that would be just extra complexity with no visible difference. For moon, on the other hand, it would make more sense to add eccentricity, which is not that complicated mechanically.

The comment about inaccurate sun size was hilarious; it should be about 100 times bigger than earth, good luck doing that (still simpler than realistic distances, would be a few kilometer radius lol).

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Posted (edited)
2 hours ago, Davidz90 said:

For moon, on the other hand, it would make more sense to add eccentricity, which is not that complicated mechanically.

If I'm looking at the right numbers, it's small enough that it's technically already doing it.  The earth's about 0.1 stud away from the center so the moon's orbit has a difference perigee to apogee of 0.2 studs, on an average radius of 7, which scaled to 385000km is 379 to 390,000km (should actually be 363 to 405... that would need more like 0.3 studs off center)  In that sense it's not precessing at all, it just matches the year, but the actual change is every 9 years anyway so pretty slow. 

I suppose you could move the earth up or down on its arm to improve that, from the same calculations putting it a stud higher would be right on the money at 0.3 studs.  Though then the moon needs to go up about a stud as well to match.

Edited by Stereo

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What a great build...I really enjoyed it.

Has anyone else toyed with the idea of motorizing this?

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