Eyes on the Skies!
We are an active L5 Society.
The L5 point(EML5) is the best location for a space colony
in the Earth-Moon System.
We coordinate the engineering details to create that colony.
Sacramento L5 Society

Mission - Help enthusiastic people find ways to actively contribute.

  • Provide sources of enabling training to facilitate engineering prototyping.
  • Establish a clearinghouse for the ongoing objective analysis of proposed space development technologies.


  • Inspire collaboration among people and groups who support and engineer practical, implementable, cost-effective paths to space settlement.

 Goal -  Consistent interaction among an ever growing number of participants.

  • Publish a record of engineering successes and project achievements.

9,8,7,... Ignition Sequence Starting..., 

4,3,2,1, and we have liftoff. 

Block 2 2020 Web site has launched

Begin EVA


Orbiting Tether with LEO Spaceport 
by Tom Tolan
Click Picture above for he Slide Show that Tom Tolan presented to the International Space Development Conference 2017
100&Change Moon Power Submission
Link: SacL5 Moon Settlement Page
What’s the most practical way to sustain permanent Moon settlements through the two week long lunar night? In 2016, the Sacramento L5 Society submitted a proposal to the 100&Change $100 Million grant program that could make affordable solar-based power continuously available anywhere on the Moon.
Affordable Spaceports 

Spaceports in the desert sound dusty? Would you put seaports in the desert?
How about Space Ports in Space?
From Analog Science Fact and Fiction
Authored by Roger Arnold and Donald Kingsbury
These articles describe a novel cheap energy way to get into Low Earth Orbit.
And once in LEO you are 90% of the way to anywhere.
(Please be patient. Each part can take up to a minute to load. The files are large to preserve the legibility of our source material.)
Here's the links 
Also check out our Moonbase Page for more information.

Our New Facebook Page 

L5 Society of Sacramento


Please visit the page and "like" us. 
Pass the "like" request onto your friends and families too!
Spinning Earth from Wikimedia Commons

No Stopping in Orbit

by Paul Turner balloonwhisperer@gmail.com

Now check out this article on our new blog: Click No Stopping in Orbit
is a common misperception that if you get rocket up high enough, say several hundred miles above the ground, there will be no gravity to pull it back down to the earth, and the rocket will be able to maneuver around. This is akin to the captain in the science fiction spaceship calling for an all halt.  In space, there is no all stop. This is because, if you are not moving in relation to the planet you are near, you are being pulled down to it by its force of gravity.  Even the moon at 240,000 miles from the earth experiences the pull of gravity from the earth. That pull of earth?s gravity is what keeps the moon from sailing off to orbit the sun.
    You can imagine that at a mere 300 miles or less, a space station would be not even ten percent farther away from the center of the earth than someone standing on the ground. In fact, the force of gravity diminishes with the square of the distance. This means that in an orbit of 300 miles from the earth, the force of gravity is about 86 percent of the force of gravity on the earth. That?s still quite a pull on a space station. The ISS ranges from 205 to 270 miles above the earth. In order to keep gravity from pulling it down, it maintains a velocity in a direction perpendicular to a line from the station to the center of the earth. According to the NASA website (www.nasa.gov), the ISS speeds around the earth once every 90 minutes. If the earth is about 25,000 miles around, at 270 miles up, the length of the orbit is approximately 27,000 miles. This means the ISS is traveling about 18,000 miles per hour along the path of its orbit.  It must travel this fast just to keep from falling back to earth. If it were to slow down, its orbit would decay. It would travel lower and lower until finally, the drag on the station from the thicker air would slow it quickly, and it would probably burn up on re-entry. Whether it would leave debris on the surface of the earth depends upon the density of the station, the metal material, and how much air drag, also called air resistance, slows it down.  When Skylab?s orbit decayed in 1979, the station did not burn up completely in descent. Parts of the station landed in Australia. Such is the power of gravity and air resistance.
Sac L5 Blog Launched!
Take a look and please let us know if you'd like to write for the blog
Affordable Moon Base

The Sacramento L5 Society has completed an analysis of solar energy means for powering a permanent Moon base through the lunar night. It appears there are ways to greatly reduce the cost of supplying this energy.

Heres' the links

Eyes on the Skies!

Join us!

Contact Joe Bland 
If you're close come to our meetings.
Otherwise, send us your websites and we'll publish them.
Send us your emails and we'll keep you informed.

Exciting News!

Our Sacramento L5 Society has an article published in the National Space Society Magazine!

Implementing the NSS Vision

We, a consensus of the members of the Sacramento L-5 Society, local chapter of the National Space Society, endorse the NSS vision: “People living and working in  thriving communities beyond the Earth, and the use of the vast resources of space for the dramatic betterment of humanity.” To implement that vision, we believe it is incumbent upon NSS to develop high-level action items.

Click here to read the full article

Contact Joe Bland 


Tsiolkovsky rocket equation

The Tsiolkovsky rocket equation, or ideal rocket equation, describes the motion of vehicles that follow the basic principle of a rocket: a device that can apply acceleration to itself (a thrust) by expelling part of its mass with high speed and move due to the conservation of momentum. The equation relates the delta-v (the maximum change of speed of the rocket if no other external forces act) with the effective exhaust velocity and the initial and final mass of a rocket (or other reaction engine).

Ted Talks

A great site to see enthusiasm for technical and intellectual excellence.
Above  is a an actual picture taken by the Cassini spacecraft of Saturn eclipsing the Sun.
Check out Carolyn Porco: This is Saturn where Carolyn describes the water on Enceladus and the thick hydrocarbons on Titan.  Nice to know there's fuel and drink available when we get to Saturn.

Monthly Meeting

Second Saturday of Each Month

We meet at meet Second Saturday's at

JP Aerospace
2530 Mercantile Drive - Directions
Rancho Cordova CA 95742-6215

Thanks for donating to the
 Sacramento L5 Society!

... and Check Out 

JP Aerospace on Facebook 

Click here

Good Reading!
Starship Century 
Toward the Grandest Horizon
Edited by
James Benford and Gregory Benford

See the full review on our blog SacL5Blog

Starship Century Review

Check out their website too.

Starship Century | Toward the Grandest Horizon

Great Reading!

Fly Me to the Moon
by Edward Belbruno

Fly Me to the Moon
by Edward Belbruno
Fly Me to the Moon
by Edward Belbruno
    This is a great book that describes low fuel low thrust orbits to take us between points of interest and residence in our Solar System and it even describes low fuel routes to other stars. The low fuel routes take longer as they surf the chaotic gravitational fields.  It's written in an easy but still mathematical style that lets you enjoy the story of the acceptance of Belbruno's ideas leading to his trajectory design that saved the Japanese Hiten Lunar mission in 1991.  Belbruno even describes low thrust ways to capture and move asteroids. 
   Imagine many adequately provisioned craft in Belbruno orbits, awaiting new destinations like a fleet of roving jitney's making low cost travel to anywhere in the solar system available to all.  So, while we plan for a permanent residence at ELM5, we can plan to hitch hike around the Solar System on Belbruno jitney's like a student on vacation with a Europass.
Posted by Ed Kulis email
Apple 3D Video Tool Demo
by Ed Kulis - ekulis@me.com

The sky is the limit? Well, why stop there? The space program inspired wave after wave of technological revolutions especially in computing and communications.   We’ve ridden this wave from our astronauts landing on the moon, through the first micro computers to the modern affordable personal workstations.  A modern iPhone puts more computing power in your hand than existed on all of the Earth in 1969.  The early personal disk drives stored 128 Thousand bytes on a 5 1/4 inch floppy disk. The floppy drive cost $500 then, about $1600 in today’s dollars and these days, 2 Trillion byte hard drives cost $79 a piece. That’s 15 Million times the storage at 5% of the price.  Just as remarkable is the price of software, dropping from hundreds for the first simple word processors to amazing free or low cost tools like the Apple Motion 3D Video Editing App demonstrated below.