25 july 1982 : First determination of the Wolfnumber with a 60mm f/15 refractor 60MM.jpg 60 mm refractor F15
1 january 1986 : First determination of the Becknumber 28 july 1986 : First photographic determination of sunspotposition by double exposure 12 november 1986 : New instrument a 102mm f/15 refractor 102MM.jpg 102 mm refractor F15
1 january 1987 : First determination of the Classification Value (CV) 1 january 1989 : First determination of the Pettis Sunspot Number (SN) 1 july 1993 : First determination of the Paderborn Sunspot Number (IS) 11 january 1994 : 1000th photographic double exposure of the sun 18 july 1996 : 3000th determination of the Wolfnumber9 august 1996 : Completely new observatory and instrumentObservatory : building of 5.6 x 3.6 m, dome of 3 m
Instrument : 125mm f/20 refractor with Baader Herschel optical wedge
Coronograph : 70mm f/15 prominence refractor with a 10 Angström bandpass filter
2 may 1997 : Birth of my own web-site !7 july 1998 : Meeting whit Rik Hill of the ALPO in Brussels Airport hill.jpg Rik Hill and me.
3 march 2000 : First digital image made using a Phillips Vesta Pro Webcam camera. 26 october 2000 : 4000th determination of the Wolfnumber16 september 2004 : 5000th determination of the Wolfnumber21 april 2005 : First light with my Coronado PST 5 june 2006 : First light with the Lille 20/20 Ha system