Orbital Mechanics

The cluster centers on discussions and corrections about how orbits work, including orbital velocity, trajectories, stability, atmospheric drag, and gravitational effects around Earth and other bodies.

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Keywords

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Sample Comments

none_to_remain • May 28, 2025 • View on HN

Orbital velocity but not orbital trajectory.

bnkamalesh • Mar 16, 2021 • View on HN

why not push it out of orbit, away from earth?

nraynaud • Sep 27, 2020 • View on HN

Wouldn’t any constant force tend to ellipticize the orbit and lead to a return to earth?

hbogert • May 17, 2025 • View on HN

my rocket seems to want to only orbit the earth b/c it doesn't know what else there is.

LargoLasskhyfv • Jul 18, 2021 • View on HN

Should be in retrograde orbit to work better in that orbital plane.

pengstrom • Oct 8, 2021 • View on HN

That's how you get orbits.

idiotsecant • Jan 21, 2026 • View on HN

Things you put in orbit at a certain elevation don't stay at that elevation forever.

blackhaz • Apr 15, 2015 • View on HN

Why wouldn't they follow a Keplerian orbit?

EdTsft • Mar 11, 2021 • View on HN

I'm not sure that it would. The Earth isn't perfectly spherical so the gravitational field will be different at different times in the orbit. Then because it is orbiting you'll also have to deal with tidal forces (bits slightly closer to the Earth will want to move slightly faster), not to mention possible acceleration from solar radiation or small amounts of atmospheric drag.

ajuc • Mar 2, 2023 • View on HN

It would change the Moon orbit too :)