22 July today in history
1678-Chhatrapati Shivaji Maharaj wins the fort of Vellore.
1981-India’s first geostationary satellite APPLE started functioning.
2012-Pranab Mukherjee was elected 13th President of India.
2019-India’s lunar mission, Chandrayaan-2 successfully takes off from Satish Dhawan Space Center, Sriharikota aiming to be the fourth nation to soft-land on the moon.
1988-Indian National Satellite (INSAT-1C) was launched.
The date 22 July is celebrated as Pi Approximation Day which is dedicated to the mathematical constant pi.
Pi Approximation Day is observed on 22 July every year because of the value of Pi that is 22/7
It gets its name from 3.14, the first three digits of the ratio of a circle’s circumference to its diameter. Always on the lookout for excuses to eat pie, some geeky math types also celebrate the number on July 22. The fraction. Both 3.14 and 22⁄7 are approximations of pi, so the two days deserve the same title.