Transit of Venus
Videos
A transit of Venus takes place when Venus passes directly between the Sun and the Earth, becoming visible against the solar disk. During a transit, Venus is visible as a small black circle moving acro
William Richard Lavender, Jeremiah Horrocks (1618–1641) (1903), Astley Hall Museum and Art Gallery
Diagram from David Rittenhouse's observations of the 1769 transit of Venus
NASA's SDO Satellite Captures First Image of 2012 Venus Transit
SDO's Ultra high Definition View of 2012 Venus Transit
Transit of Mercury
Videos
A transit of Mercury across the Sun takes place when the planet Mercury passes directly between the Sun and a superior planet. During a transit, Mercury appears as a tiny black dot moving across the S
Transit of Venus
…1761 and 1769 and following experiments. In 1663, the Scottish mathematician James Gregory had suggested in his Optica Promota that observations of a transit of Mercury, at widely spaced points on the surface of the Earth, could be used to calculate the solar parallax, and hence the astronomical unit by means of…
Transit of Mercury on November 11, 2019
Transit of Mercury on November 8, 2006 with sunspots #921, 922, and 923
Transit of Mercury, 2006 11 08 2
Mercury in true color