Transit of Mercury

By Richard Harvey

The transit of Mercury which occurred on the 11th November 2019, was the third Mercury transit this century, (other transits being 2006 and 2016). The next transit however, won’t occur till, 2032, so we felt it important that a group observation session should be arranged for the 2019 event.

With the Sun being only twenty degrees above the horizon at first contact, and heading lower, it was vital that we found an observation spot that offered a clear view of a low horizon towards the south. The Vineyard at Halfpenny Green seemed an ideal location, and we were lucky to be given permission to use the area outside the café.

Members started arriving around 11.30, to allow plenty of time for setting up scopes in readiness for first contact at 12.30. A fine array of telescopes adorned the grass area, with refractors, reflectors, and Schmitt-Cassegrains. Baader filters were firmly secured, and photographic equipment poised in readiness.

Telescopes set up for transit of Mercury
Telescopes set up with solar filters ready for the transit of Mercury
Members set up ready for the transit
Members with their scopes set up ready for the transit

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The Transit of Mercury 2016 May 9th

By Ted Thurgur

Position of the planets in their orbits, May 2016
Position of the planets in their orbits, May 2016

It is well known that only two planets, Mercury and Venus, transit the Sun, as viewed from Earth because they are the two whose orbits around the Sun lie inside that of the Earth. This is clearly shown in the diagram (Image credit to Sky & Telescope) which shows the orbits of the planets and each of their movements during May 2016. The positions of the outer planets do not change significantly on this scale.

This was the second transit of Mercury that I have observed and attempted to photograph. My first attempt was on 2003 May 7th and was previously reported in Lyra. The transit of 2006 November 8th was not visible from the U.K.

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