By David Greene
An exciting, instructive, diversified, and weird booklet, gentle and darkish: An Exploration in technology, Nature, paintings and know-how features a wide selection of issues no longer quite often present in one book.
With greater than a hundred diagrams, graphs, and figures, the themes mentioned comprise the historical past of synthetic lights, eclipse cycles, light-sensitive eyeglasses, rainbows, paintings, bioluminescence, the clock surroundings on the South Pole, zebra stripe styles, lighthouses, colour belief, the harvest moon, and the way info and speech should be conveyed via mild from the sunlight or a laser.
The publication encourages readers to take a extra cautious examine many widespread phenomena, comparable to the diversities within the length of twilight throughout the yr and the facility of human imaginative and prescient to misread styles of strains lower than definite stipulations. It describes the anatomical peculiarities of four-eyed fish and explains how the Jewish calendar contrives to stick with either sun and lunar cycles. It additionally provides the explanations why tortoise shell cats are customarily girl. Readers are proficient the place they could see nineteenth century army apparatus that may exhibit messages speedily over large adjustments.
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Additional info for Light and Dark: An exploration in science, nature, art and technology
Sample text
8412 hours, just over 50 minutes longer than the mean solar day. The lengths of individual lunar days are variable and can be almost 10 minutes longer or shorter than the mean, owing to the eccentricity and tilt of the lunar orbit. Consequently the lunar transit on successive days, measured on a GMT clock, may occur from 40 to 60 minutes later. The shift to later times on successive days also applies to the times of moonrise and moonset. 9 shows how the time of moonrise becomes later as a result of the combination of the varying lunar day and the varying length of moonlight.
8412 hours, which is just over 50 minutes longer than the mean solar day. One of the most obvious manifestations of the lunar day is the time interval between high tides. These normally occur twice per lunar day, implying an average interval around 12 hours 25 minutes. 6. 4 per cent slower than that of the Sun. This implies that the Moon becomes farther east in the sky at a given time on successive days. The slower movement of the Moon across the sky also means that in each synodic month the number of moonrises is one less than the number of sunrises.
The angles in the figure are correctly scaled but the distances are not. exactly three years during a period of eighteen years, slightly less than the time required to complete one full cycle. 5 illustrates the same phenomenon viewed from a different direction and at intervals of less than a year. 342 circuits around their common centre of gravity, which 47 LIGHT AND DARK is why the Moon is shown shifted by about 123Æ per quarter. The Moon crosses repeatedly from one side of the ecliptic to the other and back again.