Ingress of Venus and 'Black drop' effect during the 1769 Transit of Venus Product:Fine art poster 'The Double Janus Guard

'The Double Janus Guard

2 The Indians marching upon a Visit

by Robert Smirke

Headed 'Plexus arterial des cÚtacÚs

Ingress of Venus and 'Black drop' effect during the 1769 Transit of Venus Product:Fine art poster 'The Double Janus GuardTwo 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