This paper sheet is stored between two pieces of glass, with tape around the edges of the glass. It provides instructions for finding the day of the week for any date of the year, the time at different places on earth knowing the time in London, the astrological signs for different days of the year, and the phase of the moon using a specific instrument. This instrument is a combination perpetual calendar and horizontal sundial. For an example, see catalog number 330845.
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