About us

Jaap Meijers

Journalist and web developer Jaap Meijers conceived Twisst. He writes articles on technology and development aid, but also keeps coming up with new features to make Twisst even better.


Michel Schep

Michel Schep is a web developer (.NET, C#, jQuery, PHP) who is addicted to coding. Thanks to Michel Twisst now has a much better system for sending alerts.


Adam Horn

Adam Horn is a UK based IT consultant, specialising in Web, VoIP and Network services. Adam came up with a very smart new way to notify Twisst users of ISS passes.


Govert Schilling

Internationally acclaimed and award-winning freelance astronomy writer Govert Schilling consults on the project and writes the FAQs on this website.

@goverttweets / @govertschilling

Marga van den Heuvel

Marga van den Heuvel made the design for this website. She works as an illustrative designer in her own company called Appeltje-S.



The Twisst alerts are sent from a virtual private server hosted by BodisHS in Lelystad, the Netherlands.



When @twisst started, our data came from the popular Heavens-Above.com. Since June 2011 we are using the amazing Astro-satpass module to calculate the passes ourselves.

Huge thanks to Tom Wyant for creating that module and also to Marc van der Sluys (http://hemel.waarnemen.com) and Robert Simpson (@orbitingfrog, http://orbitingfrog.com) for tweaking the prediction script to perfection.

The website front end is hosted by Bhosted. And of course we owe many thanks to Twitter.com.