How to use
Total Solar Eclipse over South America - July 2019
Annular Solar Eclipse over Asia - Dec 2019
Accuracy - number of significant decimal digits:
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Didot System - used in Europe except UK
1 point = 1p = 1/2660 m = 0.37594 mm
1 cicero (pica) = 1cc = 12 p = 12/2660 m = 4.511278 mm
Pica System - UK and USA
1 point = 1pt = 996/350 mm = 0.3514 mm
1 pica = 1pc = 12 pt = 4.216867 mm
PostScript - current DTP point system used e.g in CSS (Cascading Style Sheets).
1 point = 1pt = 1/72in (cala) = 0.3528 mm
1 pica = 1pc = 12pt= 1/6in (cala) = 4.233(3) mm
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