The act of entering something — like a building or a highway — is called ingress (antonym "egress"). If you work in a busy restaurant, you have to keep your kitchen ingress and egress straight or you risk a catastrophe with a full tray of dishes.

In astronomy, ingress is also an act of entering, but it is at the beginning of an eclipse when the celestial body first begins to block the sun and cast a shadow. So in a lunar eclipse, ingress is when the Earth begins to pass between the Sun and the Moon, casting its shadow on the Moon. In a solar eclipse, ingress is when the Moon begins to pass across the face of the Sun, blocking it from the sight of observers on Earth.

Definitions of ingress
  1. noun
    the act of entering
    synonyms: entering, entrance, entry, incoming
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    the act of entering some territory or domain (often in large numbers)
    entrance by force or without permission or welcome
    a sudden violent entrance; a bursting in
    the act of entering
    enrollment, enrolment, registration
    the act of enrolling
    the act of entering into or through something
    admission, admittance
    the act of admitting someone to enter
    interpenetration, permeation
    mutual penetration; diffusion of each through the other
    market penetration
    the extent to which a product is recognized and bought by customers in a particular market
    the act of admitting someone again
    matric, matriculation
    admission to a group (especially a college or university)
    type of:
    the act of arriving at a certain place
  2. noun
    (astronomy) the disappearance of a celestial body prior to an eclipse
    synonyms: immersion
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    egress, emersion
    (astronomy) the reappearance of a celestial body after an eclipse
    type of:
    the event of passing out of sight
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