The transit will begin shortly after sunrise on the East Coast. By the time the sun rises on the West Coast. Mercury is set to make a transit across the sun on Monday morning for the last time until 2032. A pinprick of darkness will puncture a small hole in the sunlight as the planet traverses the solar disk during a 5.5-hour stretch, starting at 7:35 a.m. Eastern time. And while you won’t be able see it without protective glasses and heavy-duty telescope equipment, there are still plenty of ways to enjoy the show. NASA and the European Space Agency also will provide updates from the Solar and Heliospheric Observatory (SOHO).