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The red dragons mark out one odd-sized and 26 equal-sized central divisions; the orbital period of the moon is 27.3 days. A volvelle from the sixteenth century edition of the De sphaera mundi by Johannes de Sacrobosco. A volvelle or wheel chart is a type of slide chart, a paper construction with rotating parts.
Template:Time ago – more expansive set of functions, of which this template is a subset. Template:Birth date and age – show birthdate and age in years; Template:Years and days – show years and days for a count in days
A circular slide chart is sometimes referred to as a wheel chart or volvelle. Unlike other hand-held mechanical calculating devices such as slide rules and addiators, which have been replaced by electronic calculators and computer software, wheel charts and slide charts have survived to the present time. There are a number of companies who ...
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Tide tables, sometimes called tide charts, are used for tidal prediction and show the daily times and levels of high and low tides, usually for a particular location. [1] Tide heights at intermediate times (between high and low water) can be approximated by using the rule of twelfths or more accurately calculated by using a published tidal ...
Graph paper, coordinate paper, grid paper, or squared paper is writing paper that is printed with fine lines making up a regular grid. It is available either as loose leaf paper or bound in notebooks or Graph Books. It is commonly found in mathematics and engineering education settings, exercise books, and in laboratory notebooks.