Definition of umbral in English:

umbral

adjective

  • See umbra

    • ‘The Moon's dark umbral shadow follows a narrow path beginning at local sunrise over the South Atlantic, crosses southern Africa and the Indian Ocean, and ends at local sunset over southern Australia.’
    • ‘Further to the east and the west the observers are a few thousand miles more distant, putting them beyond the vertex of the umbral cone, so that they witness only an annular eclipse.’
    • ‘The Moon's trajectory takes it deep into the northern umbral shadow resulting in a total eclipse which lasts 1 hour 21 minutes.’
    • ‘The event is a moderate partial eclipse with the Moon's northern limb dipping 15 arc-minutes into Earth's umbral shadow.’
    • ‘The umbral phase of the eclipse lasts less than an hour.’