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Oct
13
Oct 13
The 13th is Usually a Friday
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Mar
30
Mar 30
Types of Twilight
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Dec
31
Dec 31
Leap Seconds
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Nov
28
Nov 28
4 O'Clock
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Nov
9
Nov 9
What is a Day?
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Oct
18
Oct 18
Harrison's Clocks
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Aug
28
Aug 28
Odd Dates From History
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Aug
25
Aug 25
Naming the Days of the Week
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Aug
21
Aug 21
13 Months in a Year
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Mathematics
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