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RE: Ruth Cooks!
In astronomy arc-minutes are represented with a single tick mark like this '
and arc-seconds are represented with a double tick mark like this ''
So 10-15' means 10 to 15 minutes.
In astronomy arc-minutes are represented with a single tick mark like this '
and arc-seconds are represented with a double tick mark like this ''
So 10-15' means 10 to 15 minutes.
Ah. I didn't know where the notation came from. It's common use in Greece!