529 673-735 archaeoastronomy astronomy autobiography bede biography calendar christianity chronometers civilization clocksandwatches correspondence customsandpractices earlyworksto1800 exhibitions frenchliterature greco-roman history historyandcriticism islam islamiccalendar juvenileliterature methodsoffindingthetime pendulum personalmemoirs philosophy popularworks practicalandsphericalastronomy qb213 religiousaspects science shīʻah socialaspects sociallifeandcustoms sundials systemsandstandards time timeinliterature