The venue for the workshop is the Ecogia site of the Department of Astronomy in Versoix, which can be reached by public transport. It is not in central Geneva. The "Ecogia" bus stop is a few minutes walk away from the Ecogia site, we will be using the Pavilion meeting room on the ground floor. The following site contains more information which we summarise below.
https://www.unige.ch/sciences/astro/en/contacts/contact-ecogia/
There is a direct bus between the airport, Ecogia, and Versoix Gare (bus number 50) and both the 50 and 55 run between Versoix Gare and Ecogia. The total travel time from Geneva airport to Ecogia/Versoix Gare is around 40 minutes. It is sometimes faster to take a train from Geneva airport to Versoix Gare via Geneva train station, while adding an extra connection, and of course a taxi is the fastest and most expensive option. Some more details below.
Transport from Geneva airport to Versoix Gare
There are many ways to reach Versoix Gare from Geneva airport by public transport, either by train or by bus. Conveniently, the number 50* bus from Geneva airport (direction "Versoix Centre Sportif") stops at Versoix Gare. At the airport you should buy a "Billets Tout Genève - zone 10" for 3 CHF, you can pay by credit card as well as cash.
Geneva airport bus stops and train station (Bus 50 leaves from area "B")
Geneva Airport to Versoix Gare
*Note that there is an equivalent but much less frequent bus number 54 (going in direction "Versoix Centre Sportif"), depending on what time you arrive, also leaving from area "B".
Train
To take the train to Versoix Gare, the Geneva airport train station is shown on this map. Take a train to "Genève" (Geneva central train station, also called Gare Cornavin) and change there to any train stopping at "Versoix".
Transport from Versoix Gare to Ecogia
Bus numbers 55 and 50 go directly between Versoix Gare and Ecogia every 15 minutes. Take the bus in direction "Chavannes des Bois" (bus 55) or "Centre sportif" (bus 50) from Versoix Gare to go to the observatory, and in direction "Bossy" (bus 55) or "Genève Aeroport" (bus 50) to go from Ecogia to Versoix Gare.
Free Public Transport ticket
If you ask at check-in, you should be able to obtain a free pass for public transport for the duration of your stay at most hotels within the Canton of Geneva. This is very common, so you should ask. If you are staying outside of the Canton of Geneva, such as in Nyon (Canton of Vaud), the Geneva transit pass will not be an option but they may have an equivalent.
Taxi
A taxi can take you from Geneva airport directly to Ecogia in 15-20 minutes depending on traffic and should cost around 80 CHF.
