- Ecclesiastes (/ɪˌkliːziˈæstiːz/, ih-KLEE-zee-ASS-teez; Biblical Hebrew: קֹהֶלֶת, romanized: Qōheleṯ, Ancient Greek: Ἐκκλησιαστής, romanized: Ekklēsiastēs) is one of the Ketuvim (“Writings”) of the Hebrew Bible and part of the Wisdom literature of the Christian Old Testament. The title commonly used in English is a Latin transliteration of the Greek translation of the Hebrew word קֹהֶלֶת (Kohelet, Koheleth, Qoheleth or Qohelet). An unnamed author introduces “The words of Kohelet, son of David, king in Jerusalem” (1:1) and does not use his own voice again until the final verses (12:9–14), where he gives his own thoughts and summarises the statements of Kohelet; the main body of the text is ascribed to Kohelet himself.
- In the dystopian novel Fahrenheit 451, Ray Bradbury’s main character, Montag, memorizes much of Ecclesiastes and Revelation in a world where books are forbidden and burned.
- f-number (Wikipedia)
An f-number is a measure of the light-gathering ability of an optical system such as a camera lens. It is calculated by dividing the system’s focal length by the diameter of the entrance pupil (“clear aperture”). The f-number is also known as the focal ratio, f-ratio, or f-stop, and it is key in determining the depth of field, diffraction, and exposure of a photograph. The f-number is dimensionless and is usually expressed using a lower-case hooked f with the format f/N, where N is the f-number.