| 摘要 |
<p>Perpetual calendar for the presentation of a calendar of a certain year indicating weekdays, Sundays, and holidays. Field of operation: Julian calendar system from year 1 and into an endless future. Gregorian system from year 1582 and in an arbitrary future. On the plate (A) is placed a revolving disc (D). In an outward ring (h) 2-figure years in 10 windows appear when turning the disc, as the 10-figures are printed on transparent windows on the disc, while the 1-figures are printed on (A). When the 2-figure end-figure of the wanted year appears, the Easter Full Moon date can be read in a square, marked with the wanted hundred-year. A plate (F) is moved behind fixed plate (C), until the line of the wanted hundred-year (in squares V1 and V3) is in level with markers on (C). A movable plate is moved behind (A), until the Easter Sunday is placed at the Full Moon date in the calendar, and is then drawn downwards until the 2-figure end-figure of the year can be seen in the square (V2). The calendar is now adjusted. In a simplified form (without the disc D) only weekdays are shown.</p> |
