Time 60 seconds (sec.) = 1 minute (mm.) 60 minutes = 1 hour (hr.) 24 hours = 1 day 7 days = 1 week 4 weeks = 1 lunar month 365 days = 1 year 366 days = 1 leap year Measurement of Angles 60 seconds (') = 1 minute (') 60 minutes = 1 degree (°) 60 degrees... Mental arithmetic; or, A concise system of commercial arithmetic - Page 18 by James Strachan (F.E.I.S.) - 1852 - 92 pages Full view -
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