margin of the umbra

См. также в других словарях:

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• Penumbra (disambiguation) — The penumbra is the part of a shadow where the light source is only partially blocked.Penumbra may also refer to:* Penumbra (medicine), surviving tissue at the margin of an ischemic event (such as a stroke) which is in danger of hypoxia and… …   Wikipedia

• shade — I (New American Roget s College Thesaurus) n. shadiness, shadow, umbrage, gloom, gloaming, dimness, darkness; obscurity; duskiness; shading, tone; curtain, veil, film, haziness, haze, misti[ness], cloudiness; color, hue, tint; nuance, degree;… …   English dictionary for students

• Spherical Earth — Medieval artistic representation of a spherical Earth with compartments representing earth, air, and water (c. 1400). The concept of a spherical Earth dates back to ancient Greek philosophy from around the 6th century BC …   Wikipedia

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