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Lagrange Points - L5 Society - Gravity & Orbits
"The gravity neutral point is NOT a Lagrange Point."
"There is a point, in-between the Earth and the Moon, where, even though it's at a smaller radius (and so wants to orbit faster), an object placed there is pulled by the Moon's gravity with just the correct force to counteract the difference between the angular accelerations, reducing the resultant force on the satellite and making it orbit with the same time period as the Moon.

"This point, between the two large bodies, is called L1, or Lagrange Point 1 (sometimes a Libration point). We'll see how to calculate this distance later, but the L1 is significantly closer to the Earth than the gravity neutral point (The L1 point is approx 84% of the way to the Moon c.f. the 90% calculated for the neutral point). Passing the L1 point marks the place where the satellite stops orbiting the Earth and starts orbiting the Moon."

"Strictly speaking, when you throw a ball into the air, you could technically say that the ball is in orbit.

"If you were to plot its path you’d get a very, very, eccentric ellipse with one of the foci at the center of the Earth (diagram not to scale). As mentioned earlier, with this foci being millions of meters away, the ellipse is essentially a parabola.

"When you throw a baseball, you’re launching it into an orbit; it’s just that it’s a pretty bad one and intersects with the ground! In the words of Douglas Adams, author of many fantastic books “Flying is simple. You just throw yourself at the ground and miss”

"Up until the ball hits the ground, it doesn't know that the ground is there. It's attempting to orbit a point mass at the foci of that ellipse!

"If we were able to replace the Earth with a point mass, a thrown ball would orbit and come back. Cool!"

See also
Orbital Mechanics

not: legrange
orbital_mechanics  astronomy  physics  math  elliptical_path  orbit  space  escape_velocity 
11 weeks ago by Tonti
An Incredible Video of What It’s Like to Orbit the Earth for 90 Minutes
This is easily the most awe-inspiring and jaw-dropping thing I’ve seen in months. In its low Earth orbit ~250 miles above our planet, the International Space Station takes about 90 minutes to complete one orbit of the Earth. Fewer than 600 people have ever orbited our planet, but with this realtime video by Seán Doran, you can experience what it looks like from the vantage point of the IIS for the full 90 minutes.
earth  space  orbit  video  hd  4k  planet  interesting  amazing  overview  realtime 
december 2018 by markhgn
Clorox Successfully Implements a Program for Value Chain Segmentation
By piloting this approach with several businesses, General Managers began to understand the trade-offs such as “If you focus on speed, cost will be good, but likely not industry best.” A powerful part of the process is the trade-offs conversation to establish the predominant capability needed. We used the diagram in Figure 5 to illustrate the trade-offs with the leadership teams."
supply  chain  excellence  clorox  james  foster  leadership  mark  hersh  orbit  charts  cain  insights  chains  to  admire  value  segmentation 
december 2018 by jonerp
ForgeryPy - produce fake data in Python
ForgeryPy is an easy to use forged data generator. It's a (somewhat incomplete) port of `forgery Ruby gem <http://rubygems.org/gems/forgery>`_.
november 2018 by shearichard

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