## Tahoe recreational math conference

25 Apr 2018, 15:50 UTCI've been invited to talk at a recreational math conference at Lake Tahoe April 28.I will talk about the family of conics associated with a space elevator or a vertical orbital tether.The presentation combines stuff from a number of my earlier blog posts. Here is the pdf I will use for this talk.A screenshot from the cover of the booklet.Pages 2 — 5 -- includes the visualizations I use to remember expressions for gravity and centrifugal acceleration. Which I use to show how canonical units are a whole lot easier to use than kilograms, kilometers and so on. For example the orbital periods or an orbit whose semi-major axis is k A.U. will have period k3/2 years. An asteroid whose semi-major axis is 4 A.U. will have a period of 8 years. A 9 A.U. semi-major axis gives a period of 27 years.Pages 13 — 14 -- I believe my general method for finding a ZRVTO orbit between tethers is new and original. If anyone knows of this method appearing in earlier publications, please give me a heads up.Page 14 -- Most moons we know of are in nearly circular tide locked orbits. For such moons beanstalks through Planet-Moon L1 ...