Information about visual satellite observation.

Dein Smartphone ist ein mobiles Labor.
Ähnliche Programme und Experimente gibt es auf
http://www.vieyrasoftware.net

Computer codes produced and supported by the RLE Computational Prototyping Group.
Includes FASTCAP, a multipole-accelerated capacitance extraction program,
FastImp
The c++ program FastImp is a wideband impedance extraction program for 3D geometries. It could perform Magneto-Quasi-Static (MQS), Electro-Magneto-Quasi-Static (EMQS) and fullwave analysis of complicated3D structures from zero frequency to at least tens of Giga Hertz. These 3D structures are commonly seen in interconnects and packages of VLSI circuits.

FastHenry
This is a multipole-accelerated inductance analysis program.

Found on http://www.pa3fwm.nl/technotes/, a technical note by Pieter-Tjerk de Boer, PA3FWM

Every 60 seconds, 512 bits obtained from hardware-based sources of randomness are broadcast. Each value is signed and time-stamped.

Blog about Linux file systems, feminism and more, as this article demonstrates.

Converting color temperature (Kelvin) to RGB.
The algorithm provides a high-quality approximation, but it’s not accurate enough for serious scientific use. It’s designed primarily for photo manipulation – so don’t try and use it for astronomy or medical imaging.

Gpredict is a real-time satellite tracking and orbit prediction application. It can track an unlimited number of satellites and display their position and other data in lists, tables, maps, and polar plots (radar view). Gpredict can also predict the time of future passes for a satellite, and provide you with detailed information about each pass.

OREKIT is a free low level space dynamics library written in Java. It provides basic elements (orbits, dates, attitude, frames, ...) and various algorithms to handle them (conversions, analytical and numerical propagation, pointing, ...).
It the FAQ it is mentioned that the Two Line Element (TLE) package is well validated, even some errors in the original Fortran code from NORAD were found.

The Feynman Lectures Website and Caltech are pleased to present this online edition of The Feynman Lectures on Physics.  Now, anyone with internet access and a web browser can enjoy reading a high-quality up-to-date copy of Feynman's legendary lectures.  This edition has been designed for ease of reading on devices of any size or shape; text, figures and equations can all be zoomed without degradation.

PyEphem provides scientific-grade astronomical computations for the Python programming language. Given a date and location on the Earth’s surface, it can compute the positions of the Sun and Moon, of the planets and their moons, and of any asteroids, comets, or earth satellites whose orbital elements the user can provide. Additional functions are provided to compute the angular separation between two objects in the sky, to determine the constellation in which an object lies, and to find the times at which an object rises, transits, and sets on a particular day.

The numerical routines that lie behind PyEphem are those from the wonderful XEphem astronomy application, whose author, Elwood Downey, generously gave permission for us to use them as the basis for PyEphem.