Ingress of Venus and 'Black drop' effect during the 1769 Transit of Venus Howland Great Dock Green Gate Tavern at the

Green Gate Tavern at the junction of City Road and Bath Street

'Boyle' etc

16th October 1980

to aid West India trade

Ingress of Venus and 'Black drop' effect during the 1769 Transit of Venus Howland Great Dock Green Gate Tavern at theTwo views of the teardrop effect observed during transit, as Venus is near the solar edge, but also positioned well inside the solar disc. With two additional views of Venus outside the solar disc, at 'first presage' and at ingress ['the appearance of the black notch]. Four figures of the event seen by Hirst using a 2 foot long reflecting telescope to x55 magnification. Not signed. The illustrations correspond to figures 1 2 and 5 6 [although here in