# User:Urwumpe

OrbiterWiki administrator since december 2005

Lord of the block list

A/S/L: 33/M/Wolfsburg, germany

Occupation: Full-time software developer for computer-aided engineering solutions.

Orbiter addon developer since summer 2003.

N-Mail: Urwumpe(ät)Yahoo(döt)com

We were, We are, and we will be.

## Math formulas

### Nodal regression

 ${\displaystyle P}$ Orbit parameter, ${\displaystyle p=a\cdot (1-\epsilon ^{2})}$ ${\displaystyle u}$ corrected true anomaly, ${\displaystyle u=\omega +\varphi }$ ${\displaystyle R_{E}}$ mean planetary radius ${\displaystyle J_{2}}$ non spherical gravity term ${\displaystyle i}$ inclination ${\displaystyle \omega }$ Argument of perigee ${\displaystyle \epsilon }$ eccentricity

${\displaystyle {\frac {d\Omega }{du}}=-3\cdot J_{2}\cdot ({\frac {R_{E}}{p}})\cdot \sin ^{2}{u}\cdot \cos {i}\cdot [1+\epsilon \cdot \cos {u-\omega }]}$

## Technical Drawing Gallery

Some technical drawings I made, nothing too fancy.

 Day Sum Average 3 31 10.3 4 60 15 5 75 15