They used their brains - and fingers!
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they used the position of the sun and at night the position of the stars
It is not known when, or even if, Euratosthenes did calculate the circumference of the earth. However, it is known that a very accurate estimate was obtained by Eratosthenes in the early years of the third century BC.
The abacus was invented to help people calculate.
@inpatient_cost_per_1000_per_year = (@inpatient_cost_per_1000/@member_months)* 12
Attrition rate % = (No of people moved out of the organisation during the period / Total no of people in the organisation during the period) * 100