Observing Transits of Mercury from 1631 to Now

On November 11, 2019, observers with a telescope and proper solar filters will be able to see a rare sight: a transit of Mercury across the face of the Sun.  Transits occur when a planet passes directly between the Earth and the Sun so that, looking out from the Earth, we see the silhouette of … Continue reading Observing Transits of Mercury from 1631 to Now