the ancient babylonians were charting positions of the planets and stars as long ago as 1200 bc.
the ancient babylonians were charting positions of the planets and stars as long ago as 1200 bc.
how long ago were the ancient babylonians charting positions of the planets and stars?
1200 bc
section::::chinese.









































an analysis of early chinese mathematics has demonstrated its unique development compared to other parts of the world, leading scholars to assume an entirely independent development. the oldest extant mathematical text from china is the "zhoubi suanjing", variously dated to between 1200 bc and 100 bc, though a date of about 300 bc during the warring states period appears reasonable. however, the tsinghua bamboo slips, containing the earliest known decimal multiplication table (although ancient babylonians had ones with a base of 60), is dated around 305 bc and is perhaps the oldest surviving mathematical text of china.
history of mathematics
acraea abdera









































acraea abdera, the abdera acraea, is a butterfly in the family nymphalidae. it is found in sierra leone, liberia, ivory coast, ghana, togo, nigeria, cameroon, equatorial guinea, sudan, uganda and the republic of the congo . the habitat consists of forest edges.









































both sexes mud-puddle in hot, dry weather.









































the larvae feed on "caloncoba gilgiana", "caloncoba glauca" and "oncoba spinosa".









































section::::subspecies.









































bullet::::- "acraea abdera abdera" (eastern nigeria, cameroon, bioko, sudan, uganda)









































bullet::::- "acraea abdera eginopsis" (sierra leone, liberia, ivory coast, ghana, togo, western nigeria)









































section::::external links.









































bullet::::- images at bold/a
acraea abdera