Transits of Venus –
where the planet is visible as a tiny black dot slowly crossing the sun – are
rare. The next one is happening on Tuesday, June 5th, and will be visible from North America, for a few hours just before sunset. After that, it won’t happen again for 105 years.
The Fairbanks Museum
Planetarium in St. Johnsbury opened 50 years ago, and has been operating ever
since with a single-bulb optical projector. But the planetarium is
now getting a significant upgrade, including new lighting and a digital projection system.