true anomaly - Printable Version +- HP Forums ( https://www.hpmuseum.org/forum)+-- Forum: HP Calculators (and very old HP Computers) ( /forum-3.html)+--- Forum: General Forum ( /forum-4.html)+--- Thread: true anomaly ( /thread-8127.html) |

true anomaly - nsg - 04-06-2017 11:59 PM
There is a formula that converts eccentric anomaly to true anomaly and vice versa: \[\tan(\nu/2)=\sqrt{\frac{1+e}{1-e}}\tan(E/2)\] I just noticed that \[\sqrt{\frac{1+e}{1-e}}=\exp(\tanh^{-1}(e))\] which could save some keystrokes (or precious program steps) on a calculator which has atanh function. Also this is a rare opportunity to use that built in function that almost nobody ever uses. RE: true anomaly - Geoff Quickfall - 04-07-2017 12:31 AM
Nice shortcut, But I thought marriage did that! RE: true anomaly - d b - 04-07-2017 03:25 AM
(04-07-2017 12:31 AM)Geoff Quickfall Wrote: But I thought marriage did that!Geoff; She probably always qualified, but I think that marriage granted your wife sainthood. |