4umi.com/year

< 240 BC >

MoTuWeThFrSaSu
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Events in 240 BC

19 June: By measuring shadows Greek mathematician Eratosthenes estimates the circumference of the Earth to be 252000 stadia or 39690 km, an error of less than 2%.

Presenting 240 BC

The year 240 BC was a common year starting on a Friday, just like 332 BC, 326 BC, 315 BC, 304 BC, 298 BC, 287 BC, 276 BC, 270 BC, 259 BC, 248 BC in the century before it and 231 BC, 220 BC, 214 BC, 203 BC, 192 BC, 186 BC, 175 BC, 164 BC, 158 BC, 147 BC in the next.

The coloured days highlight birthscake, deathsdagger, politicalcrown, scientificpaperclip, artisticpaperclip and otherasterisk historical milestones, and recurring events such as anniversaries and holidaysanchor. The newnew moon, waxingwaxing moon, fullfull moon and waningwaning moon icons indicate the phases of the moon and appear only for dates in the Gregorian calendar, i.e. after 14 October 1582. The Chinese calendar is available only from 1645 to 2644, the first millenium since the last reform. The coloured columns mark the Sundays, the last day of the week per standard ISO-8601.

Calculating time

The normal calendar page for the current /year?2017 contains an introduction to the intriguing history of the year as we know it. The Calendar Converter has more detail. The so called Perpetual Calendar uses a trick from before the age of computers to find the weekday for any Gregorian date. Also see an overview of all historical events in the last six thousand years.

URL: < http://4umi.com/year?240BC >, created 23 January 2011, changed 13 September 2012, served 24 April 2017.
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