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A standard sundial will read 'moontime' correctly on a full moon only. Simply read 12 noon as 12 midnight. For every day before or after a full moon the dial will be incorrect by 48 minutes. Effectively the moon dial will 'lose' 48 minutes for each day after a full moon and will be similarly 'fast' for each day before a full moon.
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The adjustements required for a 'moon dial' are shown below. |
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For days prior to a full moon you will need to add the adjustement from the indicated time and for days after you will need to subtract by the adjustement shown.
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Days from
full moon
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0
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1
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2
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3
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4
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5
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6
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7
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adjustement
(hours/minutes)
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0:0
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0:48
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1:36
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2:24
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3:12
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4:0
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4:48
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5:36
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An example of a dial for a moondial showing the time for 3 days before a full moon and 3 days after is shown below. |
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