This website is not under construction.  It is so ancient that it doesn't even serve cookies or ads.  No 25-year itch for “classic” to “new” revamp here!  It has been more or less like this since 1995 when I started it to offer my radiative transfer course notes - which did not change much either.  Subtract What's past? from What's new? for the evolution. 

The content of my pages is available under the Creative Commons BY-SA 4.0 license. I allow use of my texts and images within the conditions of this license, for example for use in free encyclopedias as Wikipedia.  I take no responsibility whatsoever for use of my material or material from others that my pages present or link to.  The same conditions apply to the photographs of Hans Nieuwenhuijzen on this website who requested me to post them here.

Verantwoording:  ik jatte "webstek" niet van onnavolgbare Interim Dichter des Vaderlands Simon Vinkenoog (1928-2009) maar van onnavolgbare collega-sterrenkundige Vincent Icke.  However, address robrutten.nl follows Vinkenoog.

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height=8mm}   Micro$oft free,  long live Linux, LaTeX, and latex2html.