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2. Umbra, penumbra and antumbra - Wikipedia

   en.wikipedia.org/wiki/Umbra,_penumbra_and_antumbra

   For example, NASA's Navigation and Ancillary Information Facility defines that a body in the umbra is also within the penumbra. [2] Scale diagram of Earth's shadow, showing how the umbral cone extends beyond the orbit of the Moon The Moon is indicated by the yellow dot.) Earth's umbra, as seen during a partial lunar eclipse

3. English grammar - Wikipedia

   en.wikipedia.org/wiki/English_grammar

   English grammar is the set of structural rules of the English language.This includes the structure of words, phrases, clauses, sentences, and whole texts.. This article describes a generalized, present-day Standard English – forms of speech and writing used in public discourse, including broadcasting, education, entertainment, government, and news, over a range of registers, from formal to ...

4. Night sky - Wikipedia

   en.wikipedia.org/wiki/Night_sky

   The night sky is the nighttime appearance of celestial objects like stars, planets, and the Moon, which are visible in a clear sky between sunset and sunrise, when the Sun is below the horizon. Natural light sources in a night sky include moonlight, starlight, and airglow, depending on location and timing. Aurorae light up the skies above the ...

5. The Elements of Style - Wikipedia

   en.wikipedia.org/wiki/The_Elements_of_Style

   The Elements of Style (also called Strunk & White) is a style guide for formal grammar used in American English writing. The first publishing was written by William Strunk Jr. in 1918, and published by Harcourt in 1920, comprising eight "elementary rules of usage," ten "elementary principles of composition," "a few matters of form," a list of 49 "words and expressions commonly misused," and a ...

6. Asterisk - Wikipedia

   en.wikipedia.org/wiki/Asterisk

   Look up * or asterisk in Wiktionary, the free dictionary. The asterisk (/ ˈæstərɪsk / *), from Late Latin asteriscus, from Ancient Greek ἀστερίσκος, asteriskos, "little star", [1][2] is a typographical symbol. It is so called because it resembles a conventional image of a heraldic star.

7. Warriner's English Grammar and Composition - Wikipedia

   en.wikipedia.org/wiki/Warriner's_English_Grammar...

   Six. Warriner's English Grammar and Composition is a series of textbooks on English grammar and composition by John E. Warriner, consisting initially of six books targeted at grades 6 through 12, in numerous editions, with publication beginning in 1946 and a 7th book added in 1959. [1] Last revised in 1981, the series was still in print at the ...