Get online for the transit of Venus with a web app
from Astronomers Without Borders' partner Esri

Learn about the transit of Venus, see observations in real time, and share your experiences of this rare event. This dynamic app gives you several ways to learn about the transit and interact with others watching it around the world.

Opening page of the Transit of Venus web app at

  • Find where and when the transit occurs around the world.
  • See contact timing observations from the VenusTransit smartphone app in near real-time on transit day, and see how they compare to the predicted times (most of the timing differences can be attributed to the black drop effect).
  • See tweets, photos, and and videos of transit of Venus activities on a world map, and share yours through hashtags and key phrases: #tov2012, #venustransit, ‘Transit of Venus’, and ‘Venus Transit’.
  • Watch a video explaining the transit, including an animation that shows the whole 6 hour, 40 minute event in one minute.

The web app is available at, and will be embedded on several websites soon, including Astronomers Without Borders, Transit of Venus and

The transit of Venus web app was developed jointly by the prototype software laboratory from Esri (a GIS software company), Astronomers Without Borders, and the team behind the VenusTransit smartphone app.