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{{Infobox solar eclipse|1997Mar09 | previous = Solar eclipse of October 12, 1996 ...

...he type of year used by [[Solar calendar#Tropical solar calendars|tropical solar calendar]]s. ...leap days]]) is designed so as to resynchronise the calendar year with the solar year at regular intervals. ...

[[File:Solar system scale-2.jpg|thumb|Approximate sizes of the planets relative to each ...f information that expressed the way the people of the time thought of the Solar System. ...

...more closely approximating the 365.2422-day [[tropical year|"tropical" or "solar" year]] that is determined by the Earth's revolution around the Sun. ...ays; when Russia and Greece did so (for their civil calendars) in the 20th century, the jump was 13 days. For other countries and territories, see [[List of a ...

...actions. The system became the standard of France and Europe within half a century. Other measures with unity ratios<ref group="Note">ratios of 1 between mag ...ts for length, mass and time. Advances in [[electromagnetism]] in the 19th century necessitated additional units to be defined, and multiple incompatible syst ...

...the [[Rhind Mathematical Papyrus|Rhind papyrus]] which dates to the 16th century BCE.<ref name="Biggs">{{cite book * c. 8th century BC&nbsp;– the [[Yajurveda]], one of the four [[Hindu]] [[Vedas]], contains ...