Editing Black drop effect (section)

==1832 Mercury transit==
The [[Shuckburgh telescope]] of the [[Royal Observatory, Greenwich]] in London was used for the 1832 [[transit of Mercury]].<ref name=":3" /> It was equipped with a micrometer by Dollond and was used for a report of the events as seen through the small refractor.<ref name=":3">{{Cite book|url=https://archive.org/details/monthlynoticesr72socigoog|page=[https://archive.org/details/monthlynoticesr72socigoog/page/n132 103]|quote=Shuckburgh telescope eastern equatorial.|title=Monthly Notices of the Royal Astronomical Society|date=1831|publisher=Priestley and Weale|language=en}}</ref> By observing the transit in combination with timing it and taking measures, a diameter for the planet was taken.<ref name=":3" /> They also reported the peculiar effects that they compared to pressing a coin into the Sun.<ref name=":3" /> The observer remarked:

{{quote2|I afterwards observed, that immediately around the planet there was a dusky tinge, making it appear as if, in a small degree sunk below the sun's surface;"|''Royal Astronomical Society, Vol II, No. 13''<ref name=":3" /> }}