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2024-07-06T00:32:16+00:00
- About:
- Software developer and (sometimes) blogger trying to figure out secret to living a healthy and content life into his 100's. #fedi22 #developer #biohacker #flutter #dartlang #kotlin #python #astronomy #engineering #science #food #baking #foodhistory #history #YeastMasters #fediverse #friendica #uspoli #lgbt
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Hank G ☑️
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vruz
in reply to Hank G ☑️ • • •Waiddaminute, even that is arguably not the definitive answer. The definitive answer is: it depends.
Earth's orbit is an ellipse, and from a mathematical point of view, ellipses have two centres (called foci), not one. From an astrophysics point of view, to simplify, people came up with the concept of the barycentre, which is the common centre of mass around which two or more objects orbit due to their gravitational attraction.
vruz
in reply to vruz • • •randygalbraith
in reply to Hank G ☑️ • • •Hank G ☑️
in reply to Hank G ☑️ • •Isaac Ji Kuo
in reply to Hank G ☑️ • • •Oh noes, you're doing it also!
The "common center" isn't the barycenter about which Earth and the Sun orbit "each other".
The Sun's position is more or less unaffected by puny Earth.
It's Jupiter and Saturn that causes the Solar System barycenter to sometimes be outside of the Sun. And Uranus and Neptune have an outsized effect because they're further away (the effect is proportional to distance and mass).
Isaac Ji Kuo
in reply to Isaac Ji Kuo • • •So I see the joke as even more meta ...
I mean ... the thing that's so frustrating is that usually the truth is too complicated to say succintly, so it's just too much effort to feel like correcting the person who spoke up with the right conclusion via the wrong reasoning.
That's the bigger problem ... the Dunning Kruger victim confidently participates in the discussion halfway around the world while the person who knows the truth decides to not bother putting their boots on.
Hank G ☑️
in reply to Isaac Ji Kuo • •Hank G ☑️
in reply to Hank G ☑️ • •Isaac Ji Kuo
in reply to Hank G ☑️ • • •Yeah, when it comes right down to it, the only way to put it in a small number of words is, "It's complicated."
For example, for cis-lunar it depends on the context, what we use. For most BOE calcs for most orbits, you want to ignore the Moon. Beyond that, for some BOE purposes, the Sun can be ignored but for others it can't.
When it comes to actual mission planning and navigation, BOE type simplifications aren't appropriate. So ... yeah, there's no short way to summarize it.
Hank G ☑️ likes this.
Hank G ☑️
in reply to Hank G ☑️ • •