Ingress
INGRESS (Lat. ingressus, going in), entrance as opposed to exit or egress; in astronomy, the apparent entrance of a smaller body upon the disk of a larger one, as it passes between the latter and the observer; in this sense it is applied especially to the beginning of a transit of a satellite of Jupiter over the disk of the planet.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)
