with Barry Clarke, Wayne Orchiston and Clive Ruggles at Melbourne Observatory (2025)
with Clive Ruggles at Melbourne (2025)
with Xiaochun SUN in Beijing (2024)
with Yunli SHI and Wayne Orchiston in Hefei
lecturer (Indonesia 2017, 2024)
Stellarium Team and IAU-WGSN meeting in Jena (2023)
with TOPOI group Berlin 2014
with Danielle Adams in Frombork (Poland) 2023

Exam

Universität Siegen
(no hat!)
Giant Telescope (tubus)
Inauguration Ceremony

Consulting Colleagues

UIN Walisongo Semarang 2017
discussing planetarium plans
Indonesia 2024
(with Youla Azkarrula)
Indonesia 2017
Mauretania 2005-2008

Scientific (public) talks

Arche Nebra 2022
Archaeoastronomy (GfA) 2015
Uni Siegen 2023

Planetarian

with art historian & romanists
with Assyriologist
Planetarium Jena 2018
Planetarium Berlin 2017
Planetarium Berlin 2016
Planetarium – Interview

Observational Astronomy

Archenhold Observatory Berlin 1998-2005
Melbourne
solar eclipse 2017 USA
Krasnoyarsk 2012
observing the transit of Venus
with Arndt Latußeck
Krasnoyarsk 2012
Portugal 2007

usual science

Jena 2017
solar eclipse preparation
USA 2017
Turkey 2006
Mauretania 2006
Mauretania 2007

organized and guided adventures

Namib 2001
Mauretania 2005
family
ASL 2004 –
Team Leader at
Astronomical Sommer Camp
Baikonur 2012 – Team Leader

Teacher Excursion

Sahara 2008 – Desert Guides